I would use:1312131212134312131212131
..given that this is clearly intended to foster blues improv I would suggest that work on multiple fingerings would be appropriate..
Curious as to why.....
Because ultimately, in improv, since the notes are not fixed, you may well end up on any note within the scale, on any given finger, and need to be able to continue in either direction comfortably without stalling/losing sense of pulse..