NO. Wrong information.
The BC250D is not capable of working with the STARNet P25 system. It doesn't work with any P25 TRS, that is why it was replaced by the BC296D. Also, the BC250 will not be upgraded in relation to rebanding of the 800 MHz band and is not capable of working in the 700 MHz band at all; for that matter neither is the 296. You had indicated you had found a 396 for a reasonable price. Go with that. For your needs, where you are, the only radios currently on the market that will serve your purposes are the BCD396T or the BCD996T.
You could wait until next month or December for the newer GRE ones if you want to be part of the "help find the bugs" crowd.