Also, speaking of Taylor --
www.taylorsfirearms.com - in their Parts section. Like the Rossi NKJ said "no" to, I do not know if the Chiappa/Armi Sport threads are sympatico also. Also check with Winchester itself (ditto, don't know of TPI/pitch has changed or not)...as Miroku has been making the .44 Mag for some time now, and as icing on the cake would actually say "Winchester" on them!
Also FYI, no such thing as a 50s Win 92. The last of the old Wins was 1940/41. All other Win 92s have been appx 90s to present Mirokus. Otherwise, custom barrel as already mentioned.
Also--a thought--might check to see if a 94 .44 Mag barrel would work. They were in production for many years late 60s or early 70s up to Connecticut plant closing. Don't know re TPI or other fit issues.
Edit: looking @ Taylor's Firearms (not the other Taylor) parts section, of the .4- calibers, they only list .44-40 barrels. Even if correct thread, etc (don't know), I also do not not know if they're .427 or .429. Cimarron and LSI (Legacy Sports) also market Chiappa/Armi Sport 92s and.in .44 Mag, but I see no parts section listing barrels. You'd have to call them.