Texas Band Plan does not really have any linking frequencies in the 439 to 440 MHz segment.
I think this area might play nicely for those wanting to experiment or have a hot spot for any of the digital nodes.
1. Pick a channel and listen
2. Try it out and make sure you have an ID capability that meets the rules if it is under automatic control and you leave it active when not at the control point.
3. Not a repeater so no coordination, but local folks could keep their own casual agreement on usage and that is Good Amateur Practice.
I would add that you should not operate a node or hotspot in the 431-433 MHz weak signal band or 435-438 MHz satellite band.
Those are the two ranges in the 70 cm band where repeater and auxiliary operation are prohibited in Part 97.
In Texas there are some FM point-to-point links in the 423-425 and 428-430 MHz ranges. I would avoide operating there.
438-440 seems to be a good empty place. That is where I run my EchoLink node and most 440-450 antennas should work OK there.
I would avoid operating a hotspot on the common FM simplex ranges 446.0-446.1 or 441.0-441.1 (according to the Texas band pland).
The Texas VHF-FM Society needs to publish their band plan for 420-440 where they coordinate point-to-point repeater links but for some reason they don't.