To my observation 11A/K are not allocated until checkin time; it may be possible to get them before this by calling SQ, though this will be with the caveat that you may be moved if someone actually wants to use the bassinet (unlikely of course).

Note that the row 11 seats are the same as all the other J seats; it is not like on some other aircraft (eg 77W) where the front row seats have considerably more room.

Also, out of curiousity, how did you get 11D/F with no status? These are supposed to be reserved for PPS or better.