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I would still suggest to solder copper wire on top of the trace for you.
The best solution of these questions is the PCB vendor that you have
selected. Different PCB vendors excel at different types of boards:
some are great at high speed, tight tolerances; others are good at
high power applications.
I think 105μ is the thickest you can get, but I do not know why you
wouldn't get it on inner layers. A PCB is just a stackup of
epoxy, copper and glass fiber. You can play with thickness at will.
I have learned a lot from your article. Quite useful and impressive info.
Eric Flores Solis
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