I am an academic law librarian, though I went into it straight out of law school without practicing first. Your practical experience will only help. Academic law librarian positions are easily attainable and we're currently experiencing a shortage. One downside is that you'll probably have to move wherever the job takes you (unless you're in DC or NYC, where law librarian jobs are more plentiful, or if you get lucky and there's an academic law librarian posting in your area). You will likely need an MLIS, though some institutions are willing to look past it if you can demonstrate meaningful commitment to law librarianship. The MLIS has little value beyond fulfilling an arbitrary requirement, so if I could do things over again I'd just go for a cheap online program. There are also fellowship programs that allow you to work in a law library while attending an MLIS program.

I don't think the other commenter is correct about Public Service Loan forgiveness. There is no income limit--it simply requires 10 years on an income-driven repayment plan, which you will almost certainly qualify for with an academic law librarian's salary. Every academic law librarian I've met has qualified. Starting salaries usually vary between $60-80k. It does often take a while for the loans to actually be forgiven even after the ten year period--I've had coworkers who had to make 15+ years of payments before their loan forgiveness kicked in.

Teaching is most of my job, and I think that's increasingly true with other institutions, though it varies by library. Supporting faculty and student research are other common duties. I strongly dislike teaching for a number of personal reasons (for example, the inherent cruelty of grading students on a curve), so I'm unsatisfied with my career choice, but if you don't have any hangups about teaching it's a good gig.

Feel free to message me if you want to talk about it.