ISSUE:

Is the oxygen of protonated ethyl methyl ether a stereogenic center?

Hello, for example, amines are not chiral as they undergo a rapid inversion that interconverts their enantiomers.
If ammonium salts, sulfur salts, sulfoxides and phosphorus compounds are chiral. I think the oxonium cations also undergo inversion and the enantiomers cannot be isolated, but I'm not entirely sure. Greetings.