how much to get navigators redrilled?

i can get some navigator wheels for 100 bucks and their chrome. but i was reading the boltpattern is different so how much am i looking at spending to get the wheels drilled out to the right pattern? i paid 100 to get wheels bored out at the machine shop but it seems like addiing 6 more holes will be more work.

no ones done it or works at a machine shop i just need a ball park number. can it even be done?

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I paid to have a set of aluminum wheels re-drilled for about $225. But I paid $150 to get my Lexus wheels bored out, so it may be cheaper in your area.

damn so 225 plus the bore ouch. i got to thinking i could get the centers bored then take a spare hub nock out all the studs and set it inside the wheels then take it to a drill press and drill out all the holes then use a biger bit to taper the ends. would this work or is it unsafe?