i also think absolute is best, as a default. but generally you have to offset -1 with editors anyway ie: a list going 1,2,3,4 is 0-3 as is the case with the Remote.
ok, so i'll wait for your new version; i can start the layout anyway. sysex can mess up midi timing if overused, and nrpn is really unintuitive to implement without a Novation Remote, as far as i can work out.
so you say the parameter numbers will be the same whether it's for NRPN(midiCC) or sysex? pretty sure lots of devices do not have same nrpn number and sysex parameter, so that's easier.
if you have any clue as to what the sysex data format is now, and the header .. :) i can at least copy that in ...