Not much of a solution is it?

If you have a prop, and you have no drill jig, here is the drill: (pun intended)
You need a drill press for this!
Fit the prop washer to the prop mounting face, and take good care that it is centered to the prop predrilled mounting hole.
Take a drill bit that exactly fits the prop washer holes, and pre-drill the back of the prop about 1/8" (3mm) deep.
Remove prop washer, and drill all the way through from the back, using a plain base surface.
Fit the prop washer to the front of the prop, and check the bolt pattern fit. If the fit is not to your liking, fit one screw, and ream drill from the front (using the prop washer as a drill guide) until the bolts slide right in.
when satisfied, drill the holes a bit larger!!!! They are not meant to keep the prop from turning on the prop drive shaft, but to allow the bolts to pass through without adding shear forces to the bolts.

Without a drill press, you need a quality drill jig to guide the drill perpendicular to the mounting faces. The rest is the same as before.
I would not recommend this.
A drill press is a must have if you want to drill your props, but if you have a drill jig it will do. Use very sharp drills, and relieve the bores generously for at least 1/128"' oversize so the bolts slide in and can be tightened without binding.
Go easy on all drilling phases, and take your time.

Once the props are fitted, check torques frequently. Those who did not do that, all report broken prop drive bolts!!
Big gassers have their own set of rules that must be adhered to.