Your point about craftsmanship is well taken, and I may reveal my own shortcomings with my next comment.
It doesn't have to be perfect as long as it looks perfect. There, I said it. (Added comment: I'm speaking of visually and not the mechanical aspects. LEL)
It looks like the trigger plate is about 1/32 proud. I have unabashedly filed away portions of set trigger plates to get them flush. Maybe not quite this much, but I can't see for sure.
If I was uncertain about filing the plate flush, I think I'd cheat. I'd probably inlet the plate a little deeper, maybe 1/2 to 1/3 of the difference, then adjust the wood on the ends, because you are only talking 1/64 or so-tapering the adjustment for a couple inches ahead and behind the plate, and maybe round the plate a little so the edges are flush but there would be a slight arc across the plate.
And maybe just the last thing. There will be some curvature to that part of the transition between lower forestock and wrist anyway.
Good luck,
Larry Luck