Any idea as to which other law schools allow students to spend two days a week in law firms/chambers during term time?

Its available at NLS only. NLUD is the only other NLU which can start it. Not many law firms are present in Hyderabad and Kolkata so NALSAR and NUJS remains at a disadvantage

NUJS has been having this practice for years. NALSAR is difficult, since it is located well away from the city and students cannot commute back and forth every day. Even NLUD already has this practice. Don't comment about what you have got no clue.

This is true

You can’t do all this with the rigor of education. That’s a good thing.

Externship replaces one of your elective courses in the trimester + These are available in the 4th Year after the grade freeze. So, rigor isn't a problem!

NUJS students have been known to do that.