Something to add. Get with whomever you are getting the passes from and tell them to put the two of you on one listing, since one wouldn't be going w/o the other. Also, make sure they put in the listing that you need a wheelchair. There is a block for it (SSR or Special Service Request) when they are creating the listing. If the seats are there, they should let you preboard like you are used to.
One other thing to consider, many times on international flights you will not be able to go through customs until you have a seat- not just a seat request. Some places will not even let you through security until you have a seat assigned. This could create a time crunch you you.
I have no 1st hand experience with London, but I will say Dublin would be a great airport for your situation. We went through security with seat requests and waited outside customs. If you don't make it you leave and try again. If you do, you move right to preclearing of US Customs before you hit your gate in DUB. When you get back to the US you are done and don't need to deal with customs. I would assume that would be a plus for battery life.
Not sure if the part about DUB helps but make sure that the SSR is on your listing. Good luck, and happy travels.
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