I've heard some Brits before (during one of our anime conventions back here) who pronounced isekai as 'ehy-sehy-kai', or some European person (I wasn't able to determine the nationality, but for sure he's not American or Canadian) speak 'ahy-sehy-kahy'. They're not even joking.
I literally don't know what you're trying to communicate by "'ehy-sehy-ka" or 'ahy-sehy-kahy'. I only somewhat assume that "h" are mute there. Write this in hiragana or the phonetic alphabet.
Literally that. I dunno how to type intonation though.