Personally I feel RELATIVELY confident that it would be safe with any factory 25-20 WCF as currently loaded, especially if the headspace is on the tight side.
That is, 'assuming' a full-pen weld or close to it. I say 'assuming' because a true full-penetration weld in the corners would require significant remachining on the inside, too much for the average smith's reasonable cost.
The Winchester wall parts man Richare Zorin owns a low wall frame that was cracked & welded & then cracked again, he uses it for a paperweight; I know this because I cannibalized the upper tang from it and returned it to him.
Unfortunately the possibility exists that some future owner will rechamber or overload the centerfire cartridge. Would be a shame to waste such an apparently attractive rifle, JMO.
Regards, Joe