Well, your unconventional fix certainly shows ingenuity. If you value this car and its reliability, would it be unreasonable to have a welder tack a new metal plate in place? I can't imagine it costing a great deal.
Anyway, if you are concerned about the washer moving, but do not want to rivet, screw or weld it into place, can I suggest Devcon 2-ton epoxy between it and the firewall? Epoxy putty might work better, because it will not run or squeeze out of the joint.
I think you are crafting a temporary fix here, but I wish you luck.
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