It would be nice not to bump resolved posts and create a new one.
You have to use a CAN bridge. Those can be PI HAT with CAN, or USB2CAN bridge.
Klipper MCU can work as a USB2CAN Bridge.
No other options.
Yes. It is expected to be used in that way.
There is no such thing as proven speed. One that works for your setup is appropriate.
Hope that helps.