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You didn't say you were that far into it ... Have you tried PB Blast? That is about the best penetrating oil on the market and has been known to work wonders if given 24 hours to soak in.
If you can't do that, you can try judicious use of heat, but if it does come to drilling and tapping, any local machine shop can probably do the job for you and it won't cost an arm and a leg. You might have to provide the new larger screws.