I could rig an SKS up like that with a bunch of JB Weld, my dremel, a few screws and maybe some hose clamps if you want it really crude and still using stripper clips.
What is actually required to make this modification successful is dremel/milling work to the bottom half of the bolt, a bit of the receiver and then just monkey work to set it at the correct angle and have a simplistic mechanism for holding the mag in place and thus not modifying it at all.
I've got the HiCal XCR adapter and I now know all the exact angles to make the rifle work or not.
From a fabrication point of view, this mod you want done is REALLY SIMPLE, just time consuming.
Currently if I remove my Wartak scope rail I can feed 10 rounds off a stripper clip no problem.
Owning the adapter that I do, almost all the thinking work is already done.
For what someone would charge you hourly for that modification, you would likely be spending less buying the adapter as they most likely do not have the knowledge of all the magical angles required.
I for one could do that job no problem but is it worth it.......................who knows.