I have not handled the OR version personally but have stripped a regular one. I see no issue with drilling out the side and mounting an AK side plate myself, which would be compatible with basically everything on the market in the US. I would consider doing the same with the CSA side mount for the VZ58 but those are out of stock everywhere for at least a yeah.
All that said I understand peoples hesitation with drilling holes in their rifle. Not me though. I'd drill it, tap it and paint it.
As it continues to be relevant, I will repost the link about making your no drill in receiver using the threaded OR's pins DIY East Block side rail adapter from GnutzGuy on YouTube for those who don't want to drill in the receiver: https://youtu.be/L2b79LsUOnQ.
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