I'm not familiar enough with T1N Sprinters to tell you a definitive yes or no to either the swivels or the recliners.
But I will offer these as food for thought:
If memory serves, the house battery on a 2006 Interstate (including the Parkway) is under the passenger-side front seat, inside the pedestal. You may not be able to install a swivel base on top of the seat pedestal while the battery is in there— unless you can lay the battery on its side to increase vertical clearance. The battery is an AGM, so lying it on its side is possible, if the pedestal compartment has the necessary dimensions.
Because the house battery is inside the front passenger seat pedestal, you probably won't be able to use one of the Toyota seats there. And at the other seat locations, I can't really say whether the existing pedestal is removable to allow you to floor-mount the Toyota swivel seats. Probably not at the driver's seat, anyway. On my NCV3 Interstate, the seat pedestal contains electrical and electronic components and so cannot be removed; I think the same is true for a T1N but I don't know for sure.
To my mind, adding the swivel bases for the existing seats is probably more doable than replacing them all the way down to floor level with the Toyota van swivel recliners.
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