This is one of those "good problems" to have - congrats.

Option 2 sounds like the clear winner, to me. I believe a bird in the hand is worth two in the bush. The distinction between T14 and Tier 2 does not seem quite so significant in view of other considerations.
First, while the cost of education varies among law schools, it is rarely cheap, so having someone bankroll you is a huge advantage.
Second, you will have the guidance and support of experienced practitioners to help you through law school, both in terms of knowledge and moral support.
Third, you really get to "kick the tires" on the profession, generally, and on this particular firm; and they get to kick the tires on you. Chances are, after making the commitment to join a firm and attend law school, you will not change your mind....but at least you have that option if you decide you hate law school, writing patent apps, or whatever.
Fourth, you emerge from law school with more than just your foot in the door, both in patent law and at a particular firm. That is a big advantage over a new law grad with good credentials and a strong technical background, but no training and a big "?" over your head. Training the new guy is a big startup cost to a firm, so you might be more heavily scrutinized approaching firms with the degree but no experience. And there's no telling what the economy and IP law market will be like in 3-4 years. Also, you would probably be riding a steeper part of the learning curve in order to become profitable as a 1st-year associate with no experience, versus having more time to learn the ropes as a part-time student and technical advisor.
This all assumes you are good with time management (you probably are or you wouldn't be in this situation), and that if you have a family/wife/kids that they are and would be understanding. Full-time law school is a big time commitment, but I imagine full-time work and part-time law school would be a tad bit more challenging.