You may consider re-drawing the board and getting it made. You went to the trouble of removing all the components. You can even get it gold-plated like in the old days :)
It's not a bad idea, actually I'm in touch with someone for making
a replica of an HP65 card reader pcb, but it's more
complicated that we can imagine.
Not because of the complexity of the layout, but because of the thickness
which is a not a common format nowadays.
The price is about 45 € for the master, and 10/15 € each unit produced.
Price could slightly increase for the master since the shape is not a regular rectangle.
Should this work (the guy is based in Sicily and I live in Milano, so logistic is slow and complex) it could be worth doing this for an HP67 logic PCB.
Thanks for suggestion, take care Alberto
Alberto:
The people at bilex-lp.com (I'm not affiliated with them) make also 0.5 mm pcbs and 0.8 mm too. The prices are very similar.