Welcome to the Forum!
The short answer to both is YES, to can come up with a system to use ‘fine adjuster’ and the 710W power is enough.
If you consider this router, take a look at The-Meticulous-z-axis and z-axis modificated and Yet-Another-Z-Axis-Mod.
You could save time save time to invent a connection, the motor would sit on the side next to the vac i guess.
Keep us posted what you come up with please. A nice router that is also used with shapeoko.
Kind regards, Gero