It's possible to edit suit charger outputs to trigger something by using "ent_fire item_suitcharger addoutput OnPlayerUse:whateveryouwanttotrigger:Trigger: 0:0:-1" or something. See
https://developer.valvesoftware.com/wiki/AddOutput for details.
I use this mysterious plugin where I have no idea of it's origin which is attached. Use sm_entfire instead of ent_fire since ent_fire doesn't work on non-dedicated servers.
I have no idea how to execute sourcemod scripts and whatnot from addoutput, but hope this helps.
Just an idea. I know you can do addoutput commands in SourcePawn