May have to head to the hardware store tomorrow and buy a couple new smaller hex key wrenches?

I have had good luck in the past of sometimes using a small torx driver bit and using in a partially stripped out hex screw, however do as last resort and be prepared to sacrifice the torx bit.
Best option is find the proper wrench. Then attack from there if that doesn't work.

Worst case scenario you may have to cut the trigger off and replace it. If that does happen a replacement should be easily obtainable and if it is a 1 or 2 screw trigger myself and I am certain many members around here probably have several of those laying around. Again with information given that is worst case scenario and I would try to find the proper wrench first.