Insha'Allah is literally just two words, if it triggers you then you have problems. It doesn't even denote a particular religion, it just means "God willing".
If you perceive a simple "God willing" as flaunting, again, you have problems.
Yes, I do lol. And idc. Jews do the same with their Yiddish/Hebrew vocabulary.
Almost nobody does, and even when we do, again, no big deal. You guys celebrate diwali and what not in public, so why can't Muslims do a simple prostration in public? It's not like Muslims are the only ones who prostrate.