I’m not sure if you can, but you don’t really need to run the vacuum pump all the time. You can switch it between the cls and vac oven and not have any issues.
As far as brands, I go cheap for my cls. We don’t need pumps that can handle solvent, if you’re running passively, we just need one to pull ambient air out of the system.
For my use, I found a 3.5cfm dual stage pump for 80 bucks, not sure if the prices are the same over there tho.