If I have Poe with advanced optics and a stored focus, can I still preform a focus action since Jan crew says when performing or being assigned a focus you may instead assign an evade? The problem I see is that I can't have more than one focus, but based on Jan technically there wouldn't be a second focus since I would take the evade instead.

Doesn't sound like it presents a problem.

2 hours ago, Browncoat50 said:

If I have Poe with advanced optics and a stored focus, can I still preform a focus action since Jan crew says when performing or being assigned a focus you may instead assign an evade? The problem I see is that I can't have more than one focus, but based on Jan technically there wouldn't be a second focus since I would take the evade instead.

There's nothing stopping you from performing a focus action when Jan is within the right range to change it to an evade token. It might be more problematic when she's out of range, because you cannot perform a focus action without assigning another focus token, which Advanced Optics prohibits.