I've wondered before if one of these would fit in place of the original heater
https://www.ebay.co....m4383.l4275.c10
You could have air con then but unlike Japan spec, still keep the open dash shelf.
You'd need a compressor, condenser etc but I bet it wouldn't be impossible.
Hi Al, it probably will work, but then you have no demist, which is kind of a number one reason to have a heater really on those cars :)