Your question on 1A / F switching is a tricky one and it is entirely a personal decision of the individuals having reserved these suites.

You may get lucky, you may not. For starters, don't assume the person in 1A/F travels as a party of 1. They could very well be doing exactly what you are trying to do.

Secondly, the 3A/F are the "least preferred" of the 6 suites by many folks in my book, so I would reckon chances of success for switching could be lesser overall if the folks in 1A/F know what they secured and care about it.

Lastly, it is still SQA388 Suites so nothing to be sniffed at. It doesn't hurt to monitor the seat map and ask later on, but be gracious about it if the request is declined. YMMV.