I am eager waiting for you to reveal those details, to know if the fixes can be applied easily to older expansion cards, even putting the fixes on a Bridge Connector...
Yes with just two capacitors I have successfully "fixed" a Microteam EXDOS card so that it works on my "bad" EP64, which it did not before the fix. It is not really a proper fix using only capacitors as there are still glitches around but on the "fixed" signals they are now just small enough not to cause trouble (ie. <0.8V); on the other signals (address lines etc), well, who knows?, it seems to work!
. I only did it to prove my theory, I have already "unfixed" it again because it is useful to me for EPNET testing.
The full EPNET fix to suppress a glitch is a resistor with the capacitor but as it is not practical to do this to every z80 signal (or is it...?
), EPNET does it on it's memory address decoding output, I/O address decoding output and a few other selected signals. Five pairs of R and C in total.
The downside is that there are signal timing implications - a R & C will delay the signal a bit - so I am keen to see if it works at 10MHz!
So yes it should be possible to bodge a Bridge Connector, or even to fix a "bad" EP internally.