If/when 25 Stevens ammo was available, that was an option for single shots and repeaters that the magazine would work with.
Rimfire and cast bullet CF, Redman or TJ’s barrel liners are no problem. Back in the day Diller and Parker Hale (Parkerrifled liners) were very popular. They are much heavier and used with jacketed bullets in high intensity varmint rifles. I read in old publications that there is everything to gain and nothing to loose by lining a barrel over using a new barrel.
I have a LR liner here, maybe today or tomorrow I’ll go ahead and put it in this barrel. I’ll document how I do that.
I’ll try and get a good photo of one of my vintage Stevens 44 1/2 rifles that has a heavy liner. That can still be done on a heavy barrel, but you would need to turn a blank down and then probably have to make up a custom piloted liner drill to install it. Or, I suppose if you turned it to a size that Jesse has a drill for, you could send it down to Oregon and have him drill it.