There is potentially another approach that might work for you.
I have seen some articles where people would use a black sharpie marker as "resist". Maybe you could put a sharpie on your router and first trace out the areas where you want to keep copper and etch away the bulk portion. The final precision traces could be machined.
My understanding is that the copper needs to be very clean and not scratched for this to work, so the Author had used polishing compound to remove the surface oxide (warned against sand paper) then did a final degrease and clean up prior to the marker work. |