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I spoke to tam/burf of BTR fab. When I got some more bottle cage mounts done. Wanted my stays crimped, 35mm fits but I wanted more clearance for mud, they basically said, no, it will 99% cause a failure unless done so minutely that it’s not worth it. It needs to be done pre weld Up etc.
Years ago i needed to "crimp" the chainstays on a BMX frame to clear a bigger chainring and i just fucking twatted them with a ball hammer. The frame never cracked
#coolstorybro
I don't think I can give general advice on this. It requires some qualified gut feeling to decide whether it is possible or not.
Take it to a framebuilder if you don't feel confident or want to do the required research. With anything DIY there is the risk of failure