Dunx.......top answer!
The only bit I would say is that Ruth Webb is the person to speak to......but maybe phoning the SLO will wake him up!!!
(Only joking - he is an ex Fish Head!)
With regards to the APC, I think I am right in saying that it is a basic test. You get a few days rostered sim time to practice using strips in Tower as opposed to a pin board, and then a medium intensity test to get onto Aerodrome 2 (3 Months) with the current course. You will also get an exam on the ANO (Air Navigation Order) but rocket science it ain't! (But it IS boring)
My advice would be to go for it.
There will be a massive shortfall nationally of controllers in the next couple of years so get in now!!! (Esp before PPP!)
As I said, post an e-mail and I'm sure many will write and give you their opinion.