You are eligible to apply for staff on any server except TS/Discord whilst banned. In accordance with the Meeting Rules, any eligible meeting attendees who are banned must be unbanned for the duration of the meeting, so yes, if you were to be accepted, you would be unbanned for the duration of the meeting and then rebanned afterwards. I cannot say for sure if you would be accepted or denied though, of course, as it is up to the TTT staff voting on whether they hold the ban against you in their votes and what their overall votes are.