>
> - Etch on a PCB and "peel" the copper off, though it
> seems very well glued on.

Could you glue copper foil to 1mm acrylic (ie rigid base) then etch ?

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The problem areas are those little islands in the middle of letters
like O and A. Assuming you started with rub-on transfers, the aim
is to add to everywhere except where there's transfer material. If
you want to keep the base that the transfers are on it doesn't leave
many options. The only mechanisms I can think of for adding material
to specific (dark) areas in the negative is to try and make those areas
conductive. You need continuity for electroplating (that is, those little
islands will not get plated), so that's out, but maybe there's a chance
if you could electrostatically charge it with a corona wire, like a copier
does, and then add material from a very fine spray gun

===================================================

If you lay down the transfers on laminate then put a coat of epoxy
over them (epoxy won't stick to laminating plastic) you could then
lift off the whole and remove the transfers with acetone. This gives
you a clear epoxy mould of the lettering. What the hell you do with
it after that, I've got no idea ;-) Perhaps roll ink onto it ? Might work
if you use a double or triple layer of transfers to give their impressions
in the epoxy some depth. A hard inflexible roller might be able to get
ink on the flat epoxy surface

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