1. FE time will be most likely worthless to your career progress since the seats are going away across the industry. Search the hiring mins at UPS, FDX, SWA, etc. It's pretty much useless without PIC/SIC time to boot.
2. In this climate, I'd hate to be a low time regional FO. Where are you going to go if furloughed? Best case another regional which isn't that great.
3. The guard is hardly part-time these days, especially the first several years after getting in. Search the board, there's a ton of info.
4. Pretty sure most UAV jobs require a security clearance. Odds of getting a contractor job without having operated them in the military are probably slim.
5. CFI will give you opportunities to learn, network, earn additional income on the side later in life, and a good plan B if you do get furloughed from an airline someday.