Question from the sidelines...maybe an idea...not sure...haven't looked into it yet...

Couldn't the LCDOUT command itself be 'hi-jacked' inside on of the macros to change the E line assignment dynamically? As far as I know, LCDs won't do squat unless the E line is pulsed.
Maybe something like:
LCDOUT $fe , $fe , 0 , "First LCD"
LCDOUT $fe , $fe , 1 , "Second LCD"
LCDOUT $fe , $fe , 2 , "Third LCD"
....and so on and so on...
As far as I know, there aren't any character LCDs any wider than 40 characters. If the second character in the 'string' was anything above $FC, it could be a 'hijack' command...
or something like that anyways...
As for myself, like I said before, I'm running 3 different types of LCDs on my OBD interface right now (16x2 parallel, 122x32 graphic mode, and a 130x130 Nokia color knockoff).
Guess which one is the easiest to interface with?