Irene - you just described my DS6 to a tee and close to the same IQ all with very close to the same issue including the montessori preschool background (he did montessori for 3 years)....we have been worried about the same thing...we homeschooled for K and he has asked to try the local public school for First grade.....I am in the same thought as you....I don't think my little guy would do very well with a strong willed, strict teacher...it would just make him either shut down or butt heads constantly.I love the description of an "irresistably stimulating" teacher. If you find one...please let me know so I can clone them!!! I know that a teacher that will go out of their way to invite a child into exploring and learning through creative approaches will be what works best for my son....keeping my fingers crossed for you!
