[@Frengo] Probably no wrist mounted variant sadly, it would be too bulky to be practical.

Silenced weapons are indeed a tricky subject, and I don't know where you saw that "Slugthrowers" were silenced, but that is a nickname for a Shotgun, first used by RC-1138 Boss. I can say that I'm pretty sure ARC-0077 Fordo used silenced DC-17 Pistols, you can tell by the extended barrel of his pistols.

One last thing that shows there were silenced blaster weapons in Clone Wars was from the Bad Batch Story Reels, where Rex and Jesse silently kill two droids with silenced blasts.