Cut the Bow itself off of that front plate.
Move that front plate forward to fill and cover the inletting over-cut.
Being tapered like it is, it will easily fill the open cut so you can do some trimming to the sides of the brass if you want to to sharpen up the sides if needed in the process.
Once that plate is in position, there will be brass missing at the rear of it now obviously (the distance it was moved forward) where the front of the trigger bow has to go back in position.
Since this is at the back of the plate and most of it underneath the curve of the front of the bow, adding on a short piece of flat brass stock and Hard Soldering it into place will hardly be noticeable when done.
I would back the butt joint up on the bottom of the plate with an extra piece to lap the butt joint over for some strength.
Then re=attach the guard bow with a blind pin or screw from underneath the soldered joint and into the base of the front of the guard bow. All soldered together.
A bit of 'patina' around that protected soldered area on the finished rifle will hide any hint of the stretch job, if needed at all..