It is possible.
1. Go to you're collection and sort it by key.
2. Select all "A" key's (for example)
3. Go to "info" tab (on the right side)
4. Click "info" and change the "A" key tex with 11B and so on.
Here I have the Rekordbox to Camelot to Traktor key notation
A = 11B = 4d
Ab = 4B = 9d
Am = 8A = 1m
B = 1B = 6d
Bb = 6B = 11d
Bbm = 3A = 8m
Bm = 10A = 3m
C = 8B = 1d
Dbm = C#m = 12A = 5m
Cm = 5A = 10m
D = 10B = 3d
Db = 3B = 8d
Dm = 7A = 12m
E = 12B = 5d
Eb = 5B = 10d
Ebm = 2A = 7m
Em = 9A = 2m
F = 7B = 12d
F#m = Gbm = 11A = 4m
Fm = 4A = 9m
G = 9B = 2d
Abm = G#m = 1A = 6m
F# = Gb = 2B = 7d
Gm = 6A = 11m
