1) MM GMT ( Ref :15/8992) has the bracelet option.
2) Case diameter is 44.00-42.50= 1.50 mm different...might not be so easily detectable.
3) If including crown, the XL would be 49mm. So you are right!
For more details, please
click here to be the previous thread which has some info.
Attached the picture here for your quick reference too.

Kong