I wouldn't ride any bike with leaking brake fluid and defective brake parts. I also leave myself wide open to litigation if I had an accident. I mean, since you know about the earlier damage, you can't say brake failure was a chance failure event.
I have the simpler earlier ABS II so I can't say how your system works, but I wouldn't want to put my life just on what I read.
I mean, they might be right unless the ABS pump did try to operate in a system that had leaked fluid, then the point about parts of the system not sharing fluid goes out of the window when you have no brakes.
Just think about your situation:
1. You have bent levers but could also have damage to the master cylinders. If the front lever was badly bent, I wouldn't risk it shearing when I was riding - I'd replace it. Not so bad if it was the clutch lever.
2. The rear brake lever bent and the rear master cyl. pushrod free play adjustment is quite important, so to is the brake light switch function.
3. You have brake fluid leaking from your braking system.
Nothing short of removal and careful inspection of all affected parts off the bike would satisfy me. For the ABS modulator, accept that it will need to be thoroughly inspected with some time off the road. Trust your mechanic and see if he is ok for you to source a boneyard unit if you can find one.
Your modulator is newer but similar to mine, most likely fluid has poured out of the reservoirs and dripped down. If there really is fluid coming out of the modulator casting body, then it could be cracked.
Yes, you have to take off some bits and pieces at the rear, but for a decent workshop it isn't too difficult.
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