I'll agree with Jim Rhoads.
If what you want is an excuse to buy another lens you should be able to find one at a reasonable price. Theres plenty of old ones out there---some very good and some pretty cr*ppy(from my experience, the good ones seem to be on the heavy & big side ymmv.) FWIW the Wollensak 162mm f/4.5 series II velostigmat is relatively small and undervalued. Look for them wherever old Speed Graphics go to die---you should still be able to get one in a working shutter for under $100.
OTOH, If you just want to experiment, a bit of the Wife's pantyhose stretched over your 180 and held in place with a rubber band works pretty good and is easier to remove than vaseline.
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