Phantasialand promptly replied and it's generally good news:
We would likely be staying in said suite so in a roundabout way it's resolved itself. Seems the only ride we'd have to queue for is FLY, hopefully it won't be too busy as suggested and we can try and time it accordingly. Or if we don't stay there then i'll just have to buy them separately, it is what it is for this park.
I believe
FLY is the ride with lockers where you cannot take phones etc. Am i right in remembering that the locker point is close to boarding? My son would be without his communication device and ear defenders at that point which would make it particularly challenging but if it's only a few minutes then again that's probably doable once if he can see the attraction. I'm assuming a device zipped up in a pocket isn't an option or attached to you in any other way? I wonder if my wife would be able to queue with us until boarding then take said items and meet us upon disembarking? I expect that's unlikely.
Oh and i also specified my sons conditions and level of autonomy and they said:
Yes, your son can use all the attractions