you could quite easily get the the EE Touche act as a Haken touch area.
its just a matter to translating the CC17-19 to an MPE midi note, then set the touch area on the patch.
also with the classic touche you could use cv via the cvc, again then altering the patch.
really, this is all more about limitations on the EE Touche, as when using in standalone more there is no ‘customisation’… and so no synth is going to be able to use ‘out of the box’… unless they happen to have CC17-19 spare, and assignable in a mod matrix.
Perhaps best approach would be to lobby EE to add an MPE mode to the touche, so it acts a single mpe ‘key’ (even better support MPE+)
anyway, trivial to do if you are using a computer, and if you wanted to do in hardware, perhaps you could use either a midi processor or something diy using an MCU (teensy etc).
note: practically speaking, if your using something like a Touche alongside the Haken Engine/Osmose, you are very likely to have to alter the patch to make use of it with the Matrix.
but yeah for most of us, using an osmose key with touch area will work fine
(I actually asked Edmund/Lippold at continuucon about possibility of supporting multiple touch areas … that’d be pretty special e.g. using like expressive Kontakt key=switches)