Wd40 works very well and will make a big difference in aluminum finishing. Not sure alcohol is ideal simply because it doesn’t have the same lubricity and the Nomad really doesn’t have the power/rpm to create lots of heat.
A nice setup would be a wd40 drip with solenoid/relay controlled by the A3 pin. That way you could leave it off during roughing and turn it on for finishing with g code automatically.
https://community.carbide3d.com/t/controlling-external-devices-with-machine/18362