Tough situation, but depending on your lifestyle, where you live, and your salary, still quite doable. You just might not have the "high class" life for a while, but it's all relative.
A rate of 2.5% sounds great--though it's possible a rate that low is for a variable 5-year loan. Either way, see what you can get. My plan is to do the same, assuming I like the job I accepted (it's not PSLF eligible). But I will wait to consolidate until about a year into attendinghood, because up until then I still get the REPAYE interest subsidy, so my rates would effectively be about 4% or so. Still, 2.5% is quite nice. However, do be careful when consolidating--while I do not think PSLF will necessarily stick around in it's current form, there is still a good chance it will. Maybe it'll get taxed, or limited, or who knows, but maybe it won't (we've yet to see any limitations and the first cohort has applied for forgiveness).
I do not think the subsidized interest would be added to the overall amount. When I log in and view my loan balance, it shows my principle and accumulated interest. The accumulated interest goes up steadily each day, then drops after my payment is made--both from my monthly payment (which is hardly anything), as well as the interest subsidy. While you would certainly see your accumulated interest tacked on to any consolidation loan (since you have to pay off the entirety of whatever loans you want to consolidate), I do not believe the subsidized interest would be added on. I believe (and it's certainly possible I could be wrong), that it's best to view the interest subsidy as Uncle Sam gave you x dollars that month in cash, no strings attached.