Advice regarding v-brake mounts
Hello! Long text ahead, sorry about that.
TLDR: TIG weld or TIG braze v-brake mounts to mountless frame, and should it be on the seatstays or on the chainstays, as it was prior?
I got this frame to build a bike for my girlfriend, it was all I could find in her size, with a derailleur hanger. Initially, I thought it was a 700c and that it runs with u-brakes, but it's a 26" and some knucklehead chopped off the v-brake mounts. It has some mild angle grinder damage (visible in pic 3), but it didn't go all the way through the tube (no holes).
I also have this unusable fork (stem stuck in steerer). I want to cut the v-brake mounts from the fork (pic 4) and weld them to the frame. I have good TIG welding skills and the possibility to TIG braze as well (CuSi3). No oxy setup unfortunately, and no possibility of getting to one. There is no issue with putting in the effort for all this, for me it's worth it.
The frame had its v-brake mounts on the chainstays. I will reinforce the affected areas with two pieces of chainstay from another chopped frame. The dilemma is:
Should I weld the v-brake mounts where they were, over the reinforced chainstays, or on the seat stays, for the sake of fitment and convenience? Will add braze-ons as needed.
Weld or braze? I was thinking either to TIG braze the reinforcements and weld the mounts over, or braze the mounts to the seat stays. My concerns are the failure of brazing due to lateral braking forces applied to the mounts (maybe solve with a brake bridge?), OR the seatstays warping and losing integrity due to welding. Am I thinking too much or should I just go for whatever?
On previous TIG brazing tests, the tube bends before the silicon bronze breaks, but I don't know how those repeated braking forces affect the joints.
Thanks in advance.