The key challenge facing Amateur/HAM radio is its reliance on the repeater network.
I would be interested in designing/programming a replacement under independent control. I am familiar with the concept of a repeater, but not the specifics of how the repeater network functions. As the power demands will be determined by the tramsceiver specs, and component selection, that leaves power system and the costs of a true off-grid stand-in unappraisable from my standpoint.
With the availability of streaming architectures, FPGAs, and RF mosfets, I see few reasons why it should be cost-prohibitive within the context of municipality, enthusiast, and charitable mission projects.
If the repeater network goes offline, then ham radio has its functional range radically reduced. Sure - some people can flip the bird to the FCC at that time and turn the power up on their amplifier, but there is considerable reliance on that repeater network.
Such a project could also be used to piggy-back other RF and microwave backup systems into them. Ideally a "place and forget" solution. As it would be expected to be a distributed construction process not for retail, prototype and pre-market technologies held by patent mills are fair game in my book.