bike wrench

Probably won't make a difference. I run 10 on 11 and have been using no name quick links for years now. They are wide enough they might even work on 8 speed, though 8 to 9 was a bigger width difference than any of them IIRC. Back 10 years ago 10 and 11 speed were actually different. I rode a Shimano rep's 9000 DA bike once and holy f bomb that was impressive shifting in all conditions.

The main thing that will not likely work together is the shuttle ramps on the cassette and chainrings like a properly matched system. You'll be relying on the pins and leverage force. The chain my be harder to shift under load. As it wears it will become harder to firmly and consistently get the correct cog for the shift index, and that will accelerate wear at the end of life and on the cassette. Any mixed drivetrain will likely have this issue. Most bikes ship with mixed drivetrains when new or at least they did a decade ago. So it shouldn't be a huge deal.

You'll be more likely to have rubbing on the end cogs in your FD cage too.