Being somewhat sewing impaired, rather than open the seam for the sleeves and epaulets my approach would have been to fold the edge of the sleeve flap and epaulet into itself and hand stitch the edge into the seam of the jacket. If done right most people will not see that the seam was not opened.

Braver people can open seams, me I'll just hide in the cracks.

Looks goods good, always impressed with your fine work.