Kamikaze
I've just noticed they have a firmware update that provides a scale mode, so that's a major obstacle out of the way fr what I want it for.
Re-mapping keys in general is not a big problem. Sonar does not allow to do this before saving notes, but allow to do this "on the fly" in MFX processors and these processors can be (quickly) bounced.
Alternatively, external (software) MIDI translators can be used to map notes before they enter Sonar.
I am not sure any ready to use solutions are there for Launchpad, but something simple it not hard to DIY quickly.
Well, not on the level of mentioned "Shove" for Ableton Push (which is specially written for it external MIDI mapper which is then used with loopback).