The problem with a tandem is they usually don't solo well due to windcock, unless you can move a seat to the center of the keel length. Think of your body acting as a sail to steer the boat. Farther forward is a jib, always pulling the bow downwind (steering you off course upwind). Farther back is a sloop mainsail, always luffing the bow upwind (swapping ends downwind).
Especially critical in coast wind, but even a place like Boerne City Lake gets comparable wind.
And that's something left out - where do you plan to take the boat?
I bought a T160 11 years ago, so I could set it up as a tandem with my young daughter. It worked great, because she learned to paddle without me saying a word. I picked this boat because the sternwell was long enough to set her up a cockpit - slidetrax were introduced that year and made the rigging easy.
(this was the day we christened it with Virgil's root beer)
That lasted a year, she wanted a boat of her own,
(Josh, that's Whit on B&R flat)
and it left me with a great boat I'm still paddling.
Some boats have movable seats on rails, making seat position adjustable for one or 2 seats - I don't know about the boats you're looking at, but KC-12 used to have seats on rails - looks like they're ramping a new business and will call it Kysek Kayaks.
But otherwise, I would consider tandem and solo kayaks to be two different boats.
ps - I looked, the Jackson has adjustable seat positions.
That said, Hobie Mirage drive is really nice, they also claim 3 different seat positions, but a 250-lb boat, you might want a trolling motor, and would definitely need a trailer.