Senginc, thanks for the helpful and practical comments. No I wasn't planning to drill the spare myself. I'm about as handy with tools as a left handed dog.
This might be a nice side project for an enterprising person who owns a machine shop. Get a mess of junkyard minispares of the appropriate wheel/tire diameter and drill 'em according to a preset Crossfire pattern. Then they could announce it here and sell to folks like myself. Oh, it's gotta be cheap. For some of the costs mentioned here, I'll just take my chances. Best, Slo