This is more of a comment. It seems you cannot use a Clone Chip or a Self-modifying Code to pull up Deus X to save your ass when accessing a Snare, Junebug, Fetal AI, etc. There is no window for paid abilities once the runner has accessed a card.
Yes, its a consequence of paid ability timings.
Last step to trigger payed is 4.3, you acess cards in 4.5
So when you see snare you cant use any payed ability.
This confused me because I assumed Deus X's ability was a paid ability, but it's a "reactional" ability (not sure what the term for it is). Deus X must be installed before you access.
It has nothing to do with Deus X. It is CSM/CloneC timing.
And Snare! But if Snare had to be rezzed in 4.3 it would work I think.