If you're ok with a cord, I'll build you one. Otherwise, I can also build you one with a backpack mounted battery. It will be pretty expensive, though.
The corded ones are an utter joke. (12A at 120V is only 2 horsepower before considering losses.) That’s the one I have occasionally dusting the floor on a warehouse type building now. My gas blower is ~6HP and it’s one model down from the largest I think. I won't have an L6-30 handy for you to use as the supply for a corded model...
A backpack battery model would be preferable anyway; I’m already wearing a 79.9 cm^2 engine, fuel tank, and blower on my back now. No one’s going to carry this as a handheld; all the large ones are already wearable for convenience.
For me, an hour of runtime would do (once the battery was 4 years old).
For it to be a commercial success, I think you’d have to be able to run 5 hours in a day (but not all at once and battery swapping/charging on the truck from 12V would be okay).
A backpack battery model would be preferable anyway; I’m already wearing a 79.9 cm^2 engine, fuel tank, and blower on my back now. No one’s going to carry this as a handheld; all the large ones are already wearable for convenience.