I have an ISA CL-GD6235 which is a Cirrus Logic card with a VGA + LCD output, spec wise the chip supports 486 with local bus so in theory I think a VLB version could have been made.

But so far not found any reference to one, tbh there isn't a lot of info on CL-GD6235 based cards as I expect they never sold to consumers (given they are designed to be connected to a LCD). My MB supports has VLB slots (and EISA but they seems even more of a long shot!) so I'd love to upgrade the card without losing my TFT screen.

They may have been non Cirrus Logic VGA+TFT cards which would probably work but not sure where to start finding them.