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One thing to try is the proper sized hex wrench and a thick flat rubber band on top to try and get it to fill gaps of the stripped head with the hex head. Since it is a low pressure bolt it just might be enough to break it loose.
Stock was 2025 aluminum which is way too soft and (imo) a stupid place to save weight on one tiny bolt. Got a stainless steel version instead from McMaster Carr (have 24 spares actually as the one I was looking for only came in a 25 pack).
This is exactly what I did last time I had that situation. Tried an easy out first, then tried a torx bit, no luck. Dremeled a slot, insert flat head screwdriver, unscrew. :)
I ended up using this method yesterday even after I bought a screw extractor kit from Harbor Freight last week. I started doing a little researching and it seemed like your method stated was the most popular and it took less than 5 minutes to remove one of the bolts for the aero bar arm cups that was seized. I had stripped the head with the allen wrench. At first the screwdriver was not able to turn it out, but by angling the screwdriver and giving it a few solid taps in a counter clockwise direction it then broke free and removed easily.