Hello from Switzerland.
Here is our plan:
DS has a Postfinance account already and a prepay Matercard with that.
I have a Postfinance account and (being British) a British bank account that I have had since I was 18 myself.
DS will get a student account when he gets to UK in two weeks time. He has researched that himself based on the very useful moneysavingexpert website. I think he is currently going with a Santander student account on basis of the student railcard that comes with it (to visit his friends from Switzerland who will distributed throughout the UK). He is fortunate and not expecting to need the overdraft facilities so that was not a consideration in his choice.
It seems that you can set up the account even now, with a confirmation that you have a place at a university. There is a question about "are you currently residing in the UK" but I think once he has a confirmed address, it must be ok to say yes to that. So it might be possible to set it up now.
With the Postfinance accounts here it costs 2CHF a time to transfer money to the UK which, when I last looked was one of the cheaper options from Swiss accounts. I will probably transfer money monthly from me to his UK account but he could also transfer some of his savings from his own Postfinance account in the same way. He can load his prepay Mastercard from his Postfinance account so has that for emergencies (although paying from things from his CHF Mastercard is not to be recommended generally as it will work out more expensive than transferring a sum regularly between bank accounts).
I have been thinking about this (and all the other logistics A LOT). DS is also reseraching phone packages as well.
This is our general plan. Might not work that way for you because I know Swiss banks can be not very friendly towards US citizens.
But basically - Santander student account, with rail discount card.