Dealing with a clearance issue

So I want to make a daughterboard to fit on top of an existing circuit board.
However, there is a 12-pin MTA156 connector in the way.

I’d rather not take the connector off the board if I can help it.

The daughterboard would plug in where the EPROMs currently sit - what I’m trying to do is instead of a ribbon cable from the sockets to the existing interface board and then a second cable to the display, I want to make an updated interface board that sits on top of the logic board (using longer bolts / spacers) then deal with a single cable to the display board.

What would be the better approach? Adding a notch on the EdgeCuts layer or a series of un-plated holes? The MTA connector will not be used at all in this application.

I’d use the notch.
Using the holes would make the boards more difficult to mate.

True, true. Besides, there wouldn’t be much material left between the holes anyway…

What about a slot?

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