Like the others, the practical way to temporarily raise height is to use a platform. Getcha that, and a ramp and drive the grill up for the videos. Drive it back down and store the ramp when done. No, wait! Knee pads. Work on your knees, that's all you need.
Just finished another leg mod on a 26 here. Bowl height is now about perfect for me, at like 36-37 inches from ground. For me, in my situation, that's the most practical way.
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OR:
Take advantage of low grill height by leaving it alone, and shooting shorter segments/shorter intervals and focus on the direct actions you're doing when AT the grill. The rest of the camera time is in the kitchen or standing at normal stance outside with camera not also trying to capture the grill + you doing something. More editing, but that is mitigated with decent software and good scripting to economize whatever it is you're trying to convey.
Full disclosure: I can't yet watch the roasted salsa video because I can't devote 20 mins to a grilling video regardless of what I'd learn from it. My brain's not wired to think grilling info should take that long to convey.