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That's great. It certainly sounds worth investigating, even if only just to find out if it's do-able--and for how much . . . .

Have you considered having the barrel lined (or re-barrelled) for .22, as was done a while back (early 20th Cent.) by Greener, Bonehill, and London Small Arms (and maybe some others)? A block...

I've got two: an Enfield 1879 M-H MkIII converted in 1897 to a M-E MkI Artillery Carbine in .303, and then ca. 1910-1912 by Greener to .22 for the (UK) NRA; the other is an Enfield M-H MkIV...