The Rans S6 would be a good choice for you. I’ve been told that Randy Schlitter, the designer of the Rans line of aircraft, is 6’ 7” tall and designed the S6 around himself. I’m about 6’ tall and use a 3” cushion on the seat. Although I fly a Group A Rans S6, the microlight version is very similar. The main difference being a constant chord wing of 156sq-ft area, compared with 116sq-ft for the Group A version. As weight lifters they are good machines. Mine has an empty weight of around 550lbs and a maximum all up weight of 1,100lbs, giving plenty of scope for fuel and crew.
Looking at the
BMAA website, there seem to be plenty of microlight instructors around the Southwest. Perhaps the best option is to visit a few of the schools near to where you live and see how you find the people there. If you haven’t flown before, perhaps a trial lesson at a couple of the most appealing locations would help you chose the one that suits you best.
Enjoy your flying.