Another possibility and probably one that I would use in the absence of a suitable tap would be to rout a hole in the panel, square, round, it doesn't matter, also a rebate, similar to fitting a router table plate. Into the hole fit a metal plate, steel, brass, aluminium, whatever, and hold the the plate in the rebate with a small countersunk screw in each corner. The plate will have a 3/4" clearance hole and the Dremel poked through the hole and held in place with the housing cap. Problem solved!
Nothing but heaven itself is better than a friend who is really a friend. - Plautus