If it is a single shot, no alterations to the bolthead would be required. If a counterbore is desired, a carbide bit will cut the bolthead without having to anneal it. Extractor work is going to be needed. The Aussies have used a plunger style ejector built into the bolthead for .223 conversions. Or a spring loaded ejector could be fitted to the left sidewall of the receiver, and the bolthead slotted for it.
In the US, the single stack 10 rd. AK magazines would work. Here, the Mini-30 magazine might be worth considering. Or, perhaps a .303 magazine could be reworked with a spacer and shortened follower.
Years ago, I fitted a SVT-40 muzzle unit to a .303. Should work on a 7.62 conversion, to finish off a carbine length barrel.
Lots of bubba'd Lee Enfields to experiment with.