For my mustache and goat, I use an old Wahl that I've had forever. I have to charge it and then leave it plugged in to get it to cut. Time for me to get a new one as well. I've got it in an old HB Travel kit that they don't sell any more.
When I go full Santa Claus, I just use my ConAir hair trimmers. That works really well with the exception of the mustache. Blade's too wide.