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By not providing dynamic DNS support, which is a standard feature for ALL other routers/brands these days, you are greatly reducing your target audience and market share this device will appeal to. I...
There are no workarounds for dynamic DNS here, let alone "simple" ones. The fact, that you suggest running ddns client on a machine internal to a network, that uses mobile carrier as an ISP, unmistakably indicates you dont understand how carrier networks set up and how they work. Carriers have they own DNS servers, and their own NAT for ALL devices, provisioned on their network. Running ddns client on such computer, which gets internet from Nighthawk, and therefore is already behind carrier NAT, creates double NAT setup, and such ddns clients do not work. It is a known fact - Google it and educate yourself. I'm also speaking from experience of trying to set this up, not just theoretical knowledge.
I also don't own a raspberrypi and buying additional, possibly expensive hardware, and spending time on learning to use it, while knowing it will almost certainly not work due to the same double NAT considerations, sounds like a VERY lousy and questionable workaround to Netgear, simply adding dynamic DNS support to their Nighthawk. As discussed - it has been a standard out of the box feature on 99.9% of routers, released in the past 5 years or even longer.
In the "stationary use case" as you refer to it, there are simply NO options/workarounds to adding dynamic DNS support.