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The chromoly liners go inside a larger holder and are button rifled.
They need to be contained like that so the rifling is properly formed.

I'm not sure if you can cut rifle a liner ? I guess...

That's my preferred option.
I think it will hear up and even if the liner starts moving it will still support the pilot and keep things mostly on track.
I will still have to ream the new hole...

Has anyone ever drilled out a barrel with a liner?

I have a #3 weight original Winchester high wall barrel.
Was .25 WCF and has a .22 liner in it that's totally buggered

I want to still it...