Mostly it has to do with what you consider to be an acceptable "look" for your rifle. I don't think anything would be wrong with using a stainless washer (or several washers) as long as it was thick enough so that it would not deform when you tightened up the action screw.
Thinking aloud here.
First of all, if I were doing this, and had any exposed wood, such as the sides of the hole where the escutcheon used to be, I would make sure I sealed it well with something so that water or moisture would not creep in and make the wood swell.
If I allowed the lamp rod to protrude through the wood so that it was higher than the bottom of the hole in which the escutcheon used to be, but lower than the outside surface of the wood, I could fill the area between the lamp rod and the wood with an epoxy, such as my bedding material and then put a stainless steel washer or two on top of that.
Another option would to make the lamp rod flush with the bottom of the hole and epoxy in a stack of stainless washers of the appropriate height.
( If any of this is not clear, send me a PM with your email address and I'll send you an quick annotated drawing of what I mean.)
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