I actually already made a custom sound ROM with "Shoot the pyramid!" removed:
https://pinside.com/pinball/forum/topic/stargate-owners-club-shoot-the-pyramid/page/9#post-2256297
I don't miss that callout barking at me at all.... I left the other miscellaneous pyramid related callouts in ("in the pyramid, in the pyramid", "get in the pyramid", and "up the middle"), so it gives enough direction without being obnoxious.