Since you DON'T WANT TO immediately upgrade to Captain, after that long a break, the company 2500 hour limit shouldn't be an issue. So after IOE you likely become Trans States MOST SENIOR FO and will MAYBE sit reserve for the rest of the month you complete IOE before you get the BEST FO lines that Trans States has. After "suffering" through a year or so of the best schedules that TSA has to offer, you'll upgrade and by that time probably be in the top 10-15% of their captains, again pulling less than one bid of reserve.
Even if TSA becomes extinct in two and a half years, that would seem too good a deal to pass up. And if a recession comes, you'd be close to furlough-proof.