I own a 2008 RR and currently have 2 faults: TPMS (light and message), and Low Coolant Level (message only)

TPMS but probably need a new control module. Is it possible to use a scanner to turn the trouble light off? remove a fuse? open up the dash and pull/disable the yellow bulb that lights the trouble light?

LOW COOLANT LEVEL. After some research need to replace the overflow tank / resevoir as the sensor goes bad over time. I would rather not do this and would prefer to use a scanner tool to remove the message. Is this a possibility?

 

Don't do it. You don't need a scanner tool. A piece of wre is enough.
The sensor isn't an integral part of the reservoir and it can be twisted and pulled out. But before you do replace it, you can simply short the wires. When they are short, the level is good, open means too low.