A couple of options
Well the Dot2 doesn't have T-coils so you can't use a blue tooth to T-coil device to use something like an e-scope.
Most likely you would need to upgrade your hearing aids if you wanted to use them to use your stethoscope.
The new Resound Alera hearing aid you can use the bluetooth phone clip with a bluetooth stethoscope to stream it directly to your hearing aids for an added boost and have your audiologist add a program with expansion off to increase the low frequency sounds for better vitals listening so you could just change to the program when you needed to use your stethoscope. As someone mentioned, you won't get a whole lot of low frequency sound into the ear without closing off the ear (you could try tulip domes if you don't mind the occlusion a little or a pair of custom receiver in the ear micromolds to wear at work could help.
The dot2 would be a tough one to pair a stethoscope with since it doesn't have wireless capabilities and doesn't accept a boot for DAI.
Your best bet would be to buy the high end E-scope amplified stethoscope for the time being and use it with a small set of tips on it so you won't have to take your hearing aids off. Your audiologist can turn on the mute button so you can hold the program button down for 3 seconds and mute the mics of your hearing aids so you can hear the vitals.
I feel for you. I have high frequency hearing loss and with my tinnitus and mild high frequency loss I struggle to hear breath sounds on the floor even with my high end littman stethoscope!