IMO you're not gonna get any benefit from the
AIO. I'd even wonder about the VM since you're using the RMG.
I don't know about the 845 over the 476S either... the 845 just might be a bit tough on the paste (you generally don't put liquids over pastes for this reason). But I really *don't* know, never tried it.
I'd do the two coats of 476S (two for complete coverage) then let it alone until the next wash (assuming you drive it). After a few days I'd do another few coats of 476S, maybe spitshining them (but it seems to layer OK for me without doing that). THEN consider spitshining with a beauty wax if you feel the need. I myself like the beading of the Collinite so much I don't usually top it. IMO many layers of 476S will provide the best protection against the cover scratches, which are probably gonna happen anyhow (sorry to be a downer about that).