You nailed it, that’s how we pronounce it.
The A from “An” must sound identical to the A from “Ark”. The accent for the A never change in french, except when it’s followed by an I, an Y, a U, an N or an M.
"Ah! Ça veut dire que les femmes ne savent pas faire une cabane?"
(This is a popular meme in France from the TV show Koh-Lanta) (notice that the first E from “femme” sounds exactly like an A and is unique to this word)
Edit: I just noticed I am completely off-topic…welp, it happens.