I'm a little confused. (Well, a LOT confused.) If I remove all (4) bolts (whether by drilling the heads off of them or removing them the "right" way), I can remove the handlebars? If I drill the head off the jacked up bolt and remove the others the right way will there be enough clearance to get a pair of vise grips on the remaining POS bolt or will I need to disassemble other things? Honestly, my concern is that 1) I really don't know what I'm doing, 2) that I don't have the right tools, 3) I don't have a garage/carport so if I have to stop in the middle of the job (storm rolls in, I'm missing a critical tool, I get stumped), I can't just stop and 4) I don't have an confidence. (it is what it is. I've jacked up more projects than I've successfully completed. Ask me about my Kawasaki Nomaglide sometime.

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If all of the above is true, what bolt(s) do I need to replace what I have? Technically, I still have the (2) bolts that came with the Lamonster phone mount plate (which is where all this started) and could mount that but I'd like to have (4) of the correct bolts on hand, just in case. (I went a different direction with the phone mount.)
I don't supposed there's anyone in my area who knows what they're doing and has the correct tools who'd like to come over for a Saturday and at least advise. I don't mind doing the work.