Hey Greg,
No worries, makes life interesting! It’s worth making a post over on the Pimoroni Forums about using a different screen with their driver board - just to see what they have to say:
Otherwise, it might be time to consider relaxing your requirement for IPS (TFT displays can be gorgeous - Pimoroni’s Hyperpixel displays are spectacular tbh), or rolling your own DSI - HDMI adapter:
Here’s an older topic about a similar situation:
And some other info I’ve found:
https://forums.raspberrypi.com/viewtopic.php?p=1023780#p1023780
I did find these two displays online made by Elecrow, but I don’t have any experience with them (and they aren’t one of our suppliers) so can’t vouch for their quality at all:
