Hopefully I'll be able to stay afloat and swimming for the whole 500m so no plans to be standing apart from entering and exiting the water. Prob wear the wetsuit anyway, as you say, a bit of experience for me and also a bit of help with buoyancy.
What day are you going to Salford? Chances are I won't make this week through fatigue and feeling a cold coming on

due to having to work a marathon set of shifts starting last Wednesday, worked 2 days then 2 nights, finished Sunday morning then back in last night / tonight, finish tommorrow morning, then back in on Thursday for 2 days then 2 nights finishing on Monday morning. I do get a few days off then but I'll be a zombie and probably in full-blown man flu mode by that stage
I am free on Saturday morning but if I feel ok I'll probably just go to the local pool this week for reasons stated above.
The wetsuit hire is a good option, especially as you say if it doesn't feel quite right. At least when I come to get my own I'll know what I'm looking for.