Can I start a script from MMM-Remote-Control or something else?

[fribse]

I have finally gotten most of it working.
I’m almost ready for halloween :-)
I’m going to create a scene that will make the light flicker, and then I want to start a movie playback via a MQTT command.
I’ve made a script that will random select a clip and play it back, and it shows up as it should, on top of the MM.
But how can I get that done?
I tried using the ‘MMM-Remote-Control’ and add a command with customcommand, but it seems that I can not just add a random command, I can only redefine the already set up commands???

The MQTTBridge sends out perfect NOTI’s, so anything that can react to this would work? Any ideas?