I would have in person lessons in a way classical instrument players approach it. The system is very successful for a reason. I would also take theory grade exams (as in no-playing, just understanding of theory), and do dedicated jazz studies.
I've seen it in many classical instrument players - zero to grade 8 within 5 years of a properly structured programme - and then being ready for conservatoire study if wanted.
Grade 8 exceeds 95% of bass work so that would set me up to play most things for the rest of my life.
Separating the academics of music from art is a well established way of doing it very efficiently.
If I won the lottery I'd quit my job and do it now!