In a RST, don't mix up the fuelling system and the ignition system which are two totally independent systems.

Fuelling is handled by KE-jetronic, a mechanical fuel injection (MFI) system by Bosch, which isn't completely mechanic because it has a electronics control box. You can't really call it an electronic computing unit ECU because it doesnät compute anything. It has nothing digital in it and certainly no programmable chips. So, back to the question, "can you live map an MFI ecu?", no you really possible can't.

The ignition is handled by ESC-II unit which on the contrary is digital and has a programmable chip. IMO, this alone makes it possible to live map, not sure if anyone does it, but it certainly has nothing to do with the type of chip, as the chip itself does not need to be used in the live mapping, but an emulator. But then again, and for abvious reasons, the chip of the ESC-II unit can do nothing for the MFI.