I used to employ a big fella well north of 100kg & 185cm.
I employed him fror his ability, personality and enthusiasm, not for ht or waistline.
Given a choice, many students choose a C172 or PA28 over a C152 or PA38.
Also, if you make a check of AOC holders and aircraft fleets, you will find that many places do not have 2 seaters for basic training so I don't think you have a problem.
Radar, try looking at different places to do your rating.