Ben, based on your experience in primary training, I'm concerned about you taking on accelerated training at all, let alone accelerated training for two certificates. I think you're going to have an exceedingly frustrating time.
Have you experienced any actual?
I have, with an instructor and a really nice plane (2012 G1000 182T), and there is NO WAY I would consider flying in actual after only having 40 hours of training crammed into my head in a week or two. Even if it's just nice, smooth marine layer. Most of that goes in one ear and out the other.
You're a DB guy. Could you learn Oracle from scratch in a similar timescale, and then go make a large scale commercial website DB on a tight schedule without making any major errors? That's basically what you're proposing to do here. Unless the IR is window dressing (in which case, why bother?).
The thing to do after you finish your IR (which, based on your previous experience, is going to take longer than you're planning for) is practice it and get truly proficient, not go on to something completely different.
I'll probably be starting my own IR in a month or so, and while I'll consider Part 141 (not at Nice Air, though -- I like to speak English), I won't consider accelerated training.