Robert Q. Riley has figured things out for trikes, both with the single wheel at the front, and at the rear.
https://rqriley.com/product/tri-magnum-trike-plans/
There are many kits to make big cruiser motorcycles into trikes, and pre-built versions if you don't want to DIY. RT Trikes (and a couple of other companies) can put two wheels on the back, or on the front, of motorcycles. Scrolling through google image results for motor trike shows a couple of companies are doing conversions where the dual front wheels tilt so the trike can lean into turns.
Search for three wheel vehicle and you'll find ones that aren't built from a motorcycle or scooter, like the Polaris Slingshot and Tanom TC-3.