It could be interesting if D-0 actually said something like, “I can help.” Like he/she voluntarily gave them the information once he/she learned to trust them (as opposed to how D-0 apparently felt about their former owner).
In this case, it could be useful to keep D-0 speaking English and just redub him. In that case, I could picture D-0’s voice being more like GLaDOS or the turrets from Portal.
EDIT:
In his scene with Finn, doesn’t D-0 ask where Rey is, and Finn says he doesn’t know. Maybe D-0 could say “Exegol” or “I know”, etc.Or use excited beeps if you kept with the beeping idea, and Finn just turned around to look at him, then cut to next scene.
I like the idea of him speaking English but having a sound similar to the turrets from Portal. Would be a great way to keep him endearing while maintaining the English and making it feel just a little more Star Warsy.