I found out that the riser board 'consumes' the headroom it makes, still missing a few mm and touching the keyboard. (A500 case and keyboard, a500+ mainboard)
The riser card might barely work if the ram board were soldered directly to it, saving a socket's height.
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So for (standard case) A500, 1000, there is not enough space to fit. I'm going to try with amiga 2000.
During the week i should be getting new ram pcbs that would not need a separator socket.
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It should be possible to build an external combination with the external dip-64 adapter to a500 side connector.