Studying for 2 at once is different than taking 2 in one window. While I'd generally agree that studying for 2 at once can be troublesome, I'd be 100% behind taking 2 or 3 in one window, especially if you're not working so free to study full-time. On the quick end of things, I've seen people who weren't working take all 4 in one window (want to say 1 guy on here did all 4 in one month – like one per week – can't remember his name though to look it up and see). The only reason I'd see to study for 2 at once would be if you were finished studying with 1 and the window hadn't opened up yet, so you started prepping a 2nd while keeping the 1st fresh in your mind.
If you're starting now (or within a couple weeks, depending on notice at work, etc.) to study full-time, you should be able to take FAR the start of April. 6 weeks of full-time study would be 240 hours of study at 40 hours/wk – most people recommend around that many hours, many can do it in less. So, planning 240 and studying more than 40 hours near the end if needed should be fine. Then I'd take off a couple days after FAR just to get a little break, then start with AUD and plan it for the end of April or start of May – again, 4 weeks would be about 160 hours, should be doable. BEC at the end of May would get you done with 3 in one window, then by mid-July at the latest you could take REG (again, about 6 weeks, about 240 hours, should be more than sufficient), and within 3 months from today you could be done with your tests.
All that being said, I wouldn't put off the job search to study. You never know when the right job will pop up. It's a competitive job market, so I'd keep my eyes open and be applying to jobs throughout that. If you get a job, you might have to slow down your exam-schedule a bit, but you can still pass them and be fine. Generally I'd advise against being job-less to study, but in this situation, I'd say you're job-less because your company eliminated your position locally, and you're using the opportunity to study. So, keep searching for a job, but if you don't find one, being able (I assume) to draw unemployment to help pay the bills while you study isn't an all-bad situation.
The NINJA materials as a stand-alone product came out after my studying was done, so I can't say for sure if they can stand on their own or not, but most opinions I've seen have indicated that they could. When I was studying, only some supplementary tools were available, so the “NINJA supplements” in my signature wasn't using the full materials as supplements, but using the supplements as supplements. 🙂