these look like they would work for you:
30mm https://www.turnermotorsport.com/p-3...pter-kit-30mm/
15mm https://www.turnermotorsport.com/p-3...bolt-kit-15mm/

i've had wheels bored out on some old BBS wheels for about $25 each at a local machinist.

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e70 - purchased 6/2018
e36 - wouldn't pass smog at 190k 2016
e53 - transmission blew at 225k 2012
e30 - sold as it was a little slow for a DD and burning oil at 220k 2011