[Roger Bolick]

Purchase a SPARE pin that matches yours. Mount this in a piece of ~1/4" aluminum similar to how yours are mounted to the hub or adapter. This is a pattern.
(pattern needs to fit in each hole on the back of your wheel so Pin is likely near edge)

Take this to the machine shop so the holes can be "deepened" at the same time as the cut, by "leveling" each wheel once.

Advise machine shop:
1. Front of wheel is visible, DO NOT Scratch.
2. Sample Pin mounted in aluminum must sit flush in each hole.
3. Do NOT touch OD of hole, i.e. use a smaller bit
4. Do NOT drill though wheel (seems obvious, but...)

Pin tip design varies wildly... but most are domed, thus a bit with a similar shape, smaller OD than the existing hole, can be used to clearance each hole.

8-10mm is ~0.35 inch, but assuming some existing clearance and a dome bit, its likely the hole just needs to be ~0.1875 deeper, and shaped to fit YOUR pin pattern.

Done properly, it seems a minor amount of material will be removed, i.e. easy.

Good luck.