I would only add that once you are *really* close to perfect alignment, you might have better luck tweaking both lasers at the same time. (Or move one laser 1/2 as much as you think it needs, then go do the same to the other one.)
I was thinking more like aligning one laser first (for example the blue), once it was perfectly aligned, turn it off and align the other one (red). But your idea should also work great
I agree with you buffo, aligning a trichro shouldn't take 5 hours, but, I can't really say, I don't have a trichro, and even if I did, I don't have different lasers to align
The only downside I can see from using a trichro is the size, as the projector should be a little bigger than if using dichros. You need mor mirrors, and the lasers should farther apart from each other to allow space for the mirrors.
Remember the future?, That'd today, as you imagined it yesterday.