I really do like take down rifles although I only have one currently in the battery (Savaga 99F from 1928) Nice classic rifle and shoots well.
Everyone likes the slick 98 take downs that have the barrel come off in a quarter turn with the forearm, but with the decreased surface area on the threads there is always the long term possibility of them loosening up. I think that the best approach (and most cost effective)might be to have a new barrel threaded to the rife to close tolerances and have the action blueprinted (trued).
If the threads are cut correctly there should only be limited wobble after 4 turns or so, and once the trued receiver mates against the shoulder on the barrel it won't be going anywhere.
Shorten the stock with a takedown fore-end bedded to the first inch or so of the barrel at the very least.
Use anti gall compound on the threads to keep them the way they should be. No tools necessary.

Besides a witness mark, you can always come up with a simple mechanical stop to keep things from shifting once the stock is on.

I was playing around with a Winchester push feed that had barrels for .225, .250 Savage improved, and .308 to test loads. I could swap the barrels without tools and all three shot within 5" of each other at 100 yards. With the difference in recoil that really surprised me. I threaded 2 of the three and the other one was pretty true from the start although I did true the shoulder.

Good luck

Tom