So many things to respond to.
As for the outdrive, yes, I was told running on one prop is what shredded the gears in my outdrive. It's possible.
I have the 1722 Furuno. I don't recommend mono. Mine works fine, and does the job, safely getting me 100 miles and back in the pitch black. But I hate the mono screen. Very hard to read. I'm not even sure color is perfect, I have no experience. If I had a choice, I would go back to the days of monochrome (green on black). But then I'm old school Air Force and loved the old radar we had on our EC-130H.
I did pick up a spare trim/tilt pump on ebay. It came with the bracket and relays. I don't know about any aftermarket.
Glenn (Wizard)
"The Reel One"
26' Billfisher