The problem with that idea is that you don't have a fence to ride against, to keep two sides at 90 degrees to each other.
However, I've had good luck with benchtop jointers.
https://beavertools.com/707400-jet-jjp-8bt-8-jointer-planer-combo.html?gclid=CjwKCAiAz4b_BRBbEiwA5XlVVuI9gqMlBDjj72IesgPnE5_Dp7G1EsgUkceE-_9AkiXclGC2ndfw2BoCkhAQAvD_BwE
RIP K.T. Osline.
She was a force in country music in the 80's, and the first woman to win song of the year with her hit '80's Ladies'.
She was battling Parkinson's when she contracted Covid 19.
^ You need a router table with fence, because there's nowhere for the bearing to ride if you're cutting a full miter.
Unless you tack a strip on top for the bearing to ride against.
Still, not the cleanest way to miter plywood.