Quite honestly, any type of bucket seat is going to look WAY out of place IMHO.
If I were you, I would choose one of two ways. Either make a split bench out of the stock front seat frame and use foam in lieu of springs. In others words, stagger the passenger seat from the drivers seat by 6-8 inches yet have both seat halves as one unit that can move on the stock tracks. Many vintage cars from the era offered such a seating arrangement, and this way the seat is pretty much always in position.
The other option is to convert the standard front seat adjustor to a powered front seat moving on tracks. On the pillar post at the level near the driver's left shoulder, install a power switch where the driver can stand outside of the L/F door and reach in to power the seat forward when passengers are loading or unloading. Then once the rear seat passengers are finished, the front seat can be motored to the position that best fits the driver. Nothing would look out of place and I think it would be quite convenient. My late wife's Volvo C70 had that option so the seat could be motored forwards while the bucket seat still folded forward so there was plenty of room for the rear passengers to get in/out of the vehicle.