Maybe a dumb question, but - if the initial thought behind this was shifting the load to Solar - rather than a hybrid hot water heater, could you just get a regular electric?
General run of the mill electric hot water heaters are cheap. You can get a 50 gallon no frills electric for less than $400 or some basic frills for around $500
If you have the solar capacity to over produce and cover the electric, that may be an alternate option.
The hybrids are more expensive up front, but in concept, more efficient and less expensive to run in the long term as they use less electric, but as you have pointed out, for your use case, the increased cost isn’t worth it.
Of course, of your over produced electric is purchased back at a 1:1 as your consumption, then it may not be worth it. But if your over produced electric is purchased back at a crappy rate, and or is only “bankable” for a year, then adding more electric use to your home may make sense.
Just a thought.