Quick update after another wash today, in case anyone's at all interested;
The Rim Wax has completely failed now, it's offering absolutely no protection at all now after just a month.
The Poorboys Wheel Sealant on the wheel is doing okay - the wheel it's protecting is, I would say, 90% clean with nothing more than a quick snow foam and rinse.
On the paint work, it's still sheeting well but not doing so well on the beading. I had applied the Candy Gloss sample from a Waxybox to half of the spoiler which did bead nicely for about a week before fading away to nothing.
Also, two weeks ago, I tried Sonax Brilliant Shine Detailer on the various panels; it's a bit finickity to work with and the finish doesn't feel particularly slick... but the shine is good and it more than makes up for all of this with both the water behaviour and durability for a QD (it's still going strong). It could quite easily be used as an LSP in in own right, although it went over the wax (and wheel sealant on half of the spoiler) on mine, and the beading is just pure porn - more details here if you're interested.
Edited to add; I forgot to mention, the C2 is still going strong.
The Dr Beasley's Trim Sealant is starting to fail though, so this will be removed altogether now and replaced with Nanolex Trim Rejuvinator in a back to back test.
I've also got a G-Techniq G5 vs PIAA Screen Protect thing going on too, but I suspect no one else is anywhere near as interested in any of this as I am so I'll leave it there.