Actually the alloy version of the
Synapse 5 comes with an optional triple. So I'm sure your LBS could swap it out for you. Most LBS will do that for only the difference in cost between the components (though a few will charge you full boat

).
I'm one of those who can't handle large jumps between gears. That, rather than your low gear, is the real reason to choose a triple over a compact. If you're comfortable with sudden large changes in RPM, then you should be fine with a compact. If not, think about the triple.