.22 Liners go into a 410 with enough room for chamber adapter and adjusting concentric on the muzzle end. Biggest issue is if the gun is now center fire or rimfire which may require offsetting the cartridge to get consistent ignition. Anything bigger than a .22 RF liner is not going to give you enough room for the front concentric.
As for soldering, DON'T, use Loctite Black Max, works great with fewer issues....
Been thinking about converting a Rook Rifle myself, just waiting to find the "right" (read as Cheap) donor rifle. Thought a side or underlever would be unique....
Hope this helps...
WBLDon
