Are there any priority lines at immigration for assisted travellers?
I am a US Citizen. cant answer that one

Once through customs, I note I will need to take a shuttle from A to F. Will the wheelchair (and assistant) be able to go on the shuttle? yes

I also note the lounge in Term F is closed (I am travelling on a business ticket).

Would I be able to use the lounge in Term A before going over to Term F (I have 3 hour connection)? note, travel a to f is 20 minutes. A lounge is nicest

Or is it best to use the lounge in between Terminal B and C (it seems this is connected to term A) - then request assistance from this lounge to the shuttle from C to F?

Or would this complicate things too much? I just dont want to be hanging around Terminal F for around 2 hours without a lounge.