First up, making a bad conversation decision can often ruin a potential alliance, as I'm sure you've realised in all your dealings with the vux. However, in this case, it isn't the conversation that would ruin your desired relations with the shofixti.
Blowing him out of the stars, on the other hand, indeed *would* cause problems.
There is no second shofixti that I know of, though I may be wrong.
As for the vux beast, I believe the arilou, or maybe the pkunk, refer to this same constellation as 'a chalice'. That clue, particularly in addition to the current one, might help you a little further.
(To be honest, I was thrown by this when I first had the clue ages ago. I know old old egyptian legends about 'a serpent that swallows the sun', and thus, having searched the serpentis system, went looking for something to do with this, alas, to no avail.