Sounds like a good plan in theory. I've never sat down doing it, but don't see why you couldn't.From listening to your experience, that makes me want to position the cone at eye level while I"m seating in a chair and have the head inches from the 5 gallon bucket so the blood can drain directly in it.
By the end of processing day my feet are aching.
We call it Slaughterday. It always falls on a Saturday...