center caps that fit 15" RPF1

[CMP]

I have a spare 14" RPF1 that I can measure as many times as you'd like. I'd not want to ship it, but... yeah. If you wanna have a huge email string with pix and measurements to get a 14" RPF1 center cap into existence I'd be game for it.

Yes please! I know that the 14" variant has a stepped hub bore, and the rear of the hub bore sits flush, which prevents use of a standard center cap design like that used on the 15" RPF1. There is a depression on the inside wall of the outer hub bore itself where a center cap may clip in. I need to know the outer hub bore diameter, the maximum diameter of overlap before protruding into the lug holes, the depth of that depression on the hub bore wall from the face of the wheel, and the volume/shape of that depression.

This is a pic Proyea kindly took for me to illustrate. As you can see the inner hub bore is irrelevant to my interests.