You mentioned you might use the stand that came with the Seaflow to mount the pump rather than the original strap. I'd be interested in know how it turns out if you do. That has been on my to-do list for a while (reducing the macerator noise).
Never, in my wildest dreams--well, maybe only there--could I attempt to do something like that.
Here’s another idea, Valterra's SewerSolution®. No motor at all.http://www.amazon.com/Valterra-SS01-Boxed-SewerSolution-System/dp/B00CCYWJQK/ref=sr_1_13?ie=UTF8&qid=1429362800&sr=8-13&keywords=valterra+rv+sewer+hosehttps://www.youtube.com/watch?t=14&v=SJ7Sk0-T4CM