Vyvanse is a stimulant.
I would not eat shrooms even in a microdose while you are on the Vyvanse.
Do you ever take breaks from the vyvanse like not taking it on weekends or on days you are not at work, school, or whatever it is you do? If so just take the shrooms in the microdose/low dose then, when you do not have to work, drive, are not stressed, etc.