I know it's somewhat counter to the basic concepts of Traveller, but I think for B&B I'm going to use an Advancement Points system to allow the acquisition of new skills and the improvement of existing skills and characteristics.
The following is what I'm currently planning on, of course it will likely need much hammering once actual play is encountered
Each character will receive Advancement Points at certain points during gameplay. These points may be used to improve Characteristics and/or Skill Ratings and to learn new skills.
Improve a Characteristic: AdvPoints = 10x Current Characteristic Value to max of 12, costs 50x Current Value to exceed 12, maximum of 16
Example: to improve from 6 to 7 cost 60 points, to improve from 11 to 12 costs 110 points, to improve from 12 to 13 costs 600 advancement points
Improve an existing Skill: AdvPoints = 5x Current Characteristic Value +1 to a maximum of 4, costs 20x Current Characteristic to improve beyond 4
Example: to improve skill from 0 to 1 costs 5 points, to improve from 3 to 4 costs 15 points, to improve from 4 to 5 costs 80 points.
Learn a new skill: Requires 5 Advancement Points, a willing teacher, 240 hours of training at a maximum of 40 hours per week and a successful roll with student’s EDU and INT modifiers for DMs. If the Teacher has a skill of 3 or higher, the student receives an additional +1 DM to the roll.
If the roll is unsuccessful, the student must spend another 40 hours of training and may then make a new roll to gain the skill. If successful, the skill is gained at Rank 0.
Note: Jack of All Trades may not be learned after the character has entered play.