Ok. If you wind up with a frame with 126 rear spacing, there are ways to modify 8-9-10 speed Shimano hubs to that spacing and then use 8-9-10 speed STI levers.
Rather than go into detail on that right now, let’s see what you buy.
For a frame with 130 rear spacing, literally any modern 8-9-10-11 speed Shimano or Campagnolo group will fit.
So, buy the frame first.
Please keep us posted.
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