And if you can put the vac outside (or near door) so the dust that does escape will be outside and not coating your garage.
All bar one of my festool dust extractors allow me to use a second hose on the dust extraction ports. On extremely warm days, it really helps. I can send the warm air from the motor through the hose and out of the window.
With regards to remote switching- I have 50ft of hosing for my HVLP sprayer. I try to keep it as far away from the area where I am spraying as possible. I purchased some remote control pass though plugs. When I want to start spraying, I press the button on the remote control and it turns the unit on.
I paid a tenner for the remote and pass through plug.
Something similar to this
If you are concerned that you will forget to turn on a non-auto switching dust extractor, you can use an extension lead to supply both the tool an vacuum and then use the remote control to power both simultaneously. Without using the remote, you won't be able to use the tool.