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not even that many. You cant create all 228 units so it is much smaller
Wrong. A unit existing is not determined by whether it can be created or not. There are 228 registered units, and if you think otherwise, then open Stardat.mpq Arr\Units.dat.
Hex editing the trig section is easy. It's a matter of understanding it. Like a trigger that has only one action is the same size as a trigger with 64 actions, and every action is written the same way. Having it written the same way also makes it easy for your purpose. Just go to campaigncreations.org and you can find the trigger format there.