How to pronounce “ashimmer” in English

"Mum?" she asks, jaw dropping as she stares up at the giant borg on the doorstep.It's at least three meters high, silvery and fluid, thin as a schwa, all ashimmer with otherworldly transcendent wossname.It's neither beautiful nor handsome, though it's intensely aesthetically pleasing in a way that demands some sort of genderless superlative that no human