don't know why anyone would bother sportorizing an original. If you are looking for a project gun there are plenty of sporterized milsurps already available. I own a church hill 303 and a parker hale 303 wouldn't dream of doing anything to a original.
You aren't thinking realistically. Back in the day when most rifles were sported it was big business. The shooting magazines used to be full of surplus firearms at outrageous prices. I can remember a lovely 20mm Solothurn semi auto anti tank gun, complete with a ten spare mags and a heavy scope, mounded in a bracket that fit on the side of the gun. This thing was a work of art that was built in Switzerland. It was polished and blued like the best commercial firearms.
It was all I could do to pick it up. Must have weighed close to one hundred pounds. It was a crew served gun of course. When I picked it up from Golden State Arms it came with all the accessories other than a tripod, which they wanted another $20 for. I declined the tripod in lieu of ammo.
This thing was as outrageous as it was accurate. At 500 yards it would completely penetrate a 4ftx4ftx1in sheet of AR plate like it wasn't there. Under the right circumstances it could be a devastating firearm. They never batted an eyelash when it came through customs. One guy commented I would have to buy a Bren Gun Carrier to get around with it. I sold that gun a few months later, haven't seen another one since.
The story is off topic. I only told it because that was 45 years ago and I am trying to get across what was on the market and available back then. The No4 MkI T rifles we so prize now were offered in their crates with all matching components for $80. Garands, new in grease or FTRed were $60. A good wage back then was $40 to $80 for most people, some made more but that was the average back then. Lots of Stens, Thompsons, Sterlings, Mas 49s, Madsens, MP 38s and 40s to name a few submachine guns. Then every other rifle and machine gun used during WWI, WWII, Korea and Viet Nam as well as every little bush war all over the world. The warehouses were piled with them to the rafters and governments were broke. In early 1950 you could buy a fully functional Halifax, Lancaster, B17, B25 for less than the value of the fuel in its tanks. P40s, Hurricanes, Spits, P51s etc were a bit pricier but not much. This is just a few. Everything was available. Nations like Israel were purchasing as many ex Axis aircraft as they could get their hands on. Often they were told to come and take them away.
Everything was plentiful and cheap. History was for museums. People had very little spare cash on hand and practicality was the word of the day. Lots of vets were familiar with these rifles and many wanted absolutely nothing to do with them. Some were actually shaken by the sight of them. Much different from today's rose colored world we live in now in Canada. Many more people back then were also do it yourselfers and some were quite skilled at what they did. You mentioned Parker Hale and BSA. They weren't the only ones by a long shot. Just some of the better known companies that did very good work.
For all of the milsurps that were sportered, ten more went to the smelters. Most of them still new or FTRed in the grease. By 1949 when it was evident Canada, England, Greece, Australia, Turkey, USA etc were goint to get into the thick of it in Korea, they had to start up the old Long Branch plant to produce new No4 MkI* rifles as well as Brens and Stens. They had sold, lend leased, given so much of their equipment away they didn't have enough left to go to war with. Not only that but Greece and Turkey had put in orders for more.
Of course the Garands, SVTs and other notable semi autos of WWII fame changed the demand for bolt action rifles. Everywhere but South America it seems. But they soon got the bug as well. That meant millions upon millions more surplus firearms were sold out of service or destroyed. The Soviets and French would only trickle their stuff out. Now, with the new UN agreements, the remaining stockpiles of ammo and firearms will soon dry up.
With the undeclared war between Russia and Ukraine I wonder how long the cheap 7.62x39 and 54 will last???? Many of those firearms were coming from the old salt mines that were converted to storage vaults for all the old satellite nations unused firearms and ammo. The few that are sold for surplus here are drops in the bucket. The only remaining supplier will be China. I really miss that South African non corrosive 7.62x39. Consistent and accurate in a bolt action.
I don't hear many people crying about bubbaing and SKS or Mosin Nagant. Why?? Because they are cheap and plentiful and only a few that are really familiar with them appreciate their value. Most just use and abuse them.