In the .22 Lee Enfield thread, I mentioned that I just installed a liner in a SMLE barrel. Turned up an adapter to fill the chamber, bonded it in place, then ran the drill through to open out the bore end-to-end for the liner, and then bonded it in place. Maybe a couple of hours of labour and lathe time to turn and fit the adapter, drill out the barrel, and install the liner.
That would be the easy part.
Setting up the breech end could be complicated. No idea whatsoever what the breech of the barrel should be like, or how a rimfire bolt could be set up.
Paying someone to do experimental work could get pricey.