Actually Just tried it and looks great.By cutting a hole in the CP image and simply placing an oversized trackball image first before the cp in the control panel, your pattern would have to be round and probbably twice the size of the trackball hole, you would only be limited to the size of your CP.
Re-uploaded
[ATTACHED IMAGE - CLICK FOR FULL SIZE]
My Mame Artwork
https://drive.google.com/drive/folders/1OP43Qk_2uCIJ7HLY2maemAmJHtu9kbyV?usp=share_link
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