I upgraded mdr1rbt mk2 to mdr1abt.
It seems to allow more noise from outside. Definitely doesn't block outside noise all that well. But when you increase the volume, this isn't seems to be much of a worry. (Apart from your hearing), but seems the sound signature is alright to listen at higher volume (doesn't get too faitguing).
Have a try.
Personally I stick with Sony because at this moment in the their Bluetooth performance is best in class. BT Range, reliability, battery life.
Apart from Sony mdr1abt.
Sennheiser momentum wireless (has noise cancelation, ear cup is not fully full size/over ear)
Sennheiser urbanite XL (no noise cancelation)
B&O H7 (wireless, no noise cancelation, over ear, block outside noise very well though)
Have you try on-ear?
Seems that is more along the line of what you are after.
Momentum on-ear wireless
Note: Most of the noise cancelling headphone has switch off function.
Most over ear headphone provide a fair degree of passive noise isolation.
Perhaps what you are after is more along the line of earbud?
Plantronic back fit go?