Duplex MidiAction send sysex?

I’m working on a Duplex interface for a Fostex VM200 digital mixer.
I need to associate 2 different sysex message sending with 2 of it’s buttons.
I know i can send sysex from the midi device class (in the init function). I can make 2 diifferent configuration file assotiated with 2 different midi_device that send each of them a different sysex…But it’s messy
But how can i select which sysex i send without writing a new application and with the actual library possibilities?
Is there any existing function from Duplex/MidiActions or equivalent that can be invoked from the Controller Configuration File ?