Remind me how you build the pool for Alien (not in FG just in the game rules) and how the dice mechanic works.
At its simplest you could do something like this in formula for [a]:
[a]d6+[b]r6
You put the dice (excluding stress) in [a] and you put stress in [b]
The 3D dice wont show a RED dice but the chat will show the red dice at the end.

