Well, let me start off by saying that I think you're being a little shortsighted in a couple different areas here.
First off, you readily admit that you don't really have a need for a laser at this point in time, so why are you heavily basing this plan around mounting all your shit to a LAM? I understand it's probably the easiest commercial option at this point (kind of), but it seems like an unnecessary waste of that capability (IR/VIS Lasers) for the cost. If cost is a factor, and all you're really trying to do is have a white light/RDS in one unit, why not pick up an MRD, get a picatinny mount/riser for it, and figure out someway to mount a white light to the mount? It'd be cheaper and accomplish the same goal.
Now, if your entire plan is to mount all this stuff on a LAM for the sole reason that you plan on purchasing NODs in the future, this is where you're being even more shortsighted.
Even with Gen 3 NV, you ARE going to want an external IR illumination source (there's a reason why a lot of LAMs come with them). Your plan, as of right now, has you purchasing a LAM (however much it costs) and disabling one of it's major features (and one you'll need with NV) in favor of a white light. With that gone, after the purchase of NV, you'll have to spring for a separate IR illuminator, thereby negating the whole purpose of this project to begin with.
Once again, maybe I'm just not understanding what your end goal is (other than "I just want to bolt all my shit to one mount"). In any case, the
Wilcox RAPTAR is damn near as expensive as the DBAL D2, but offers a more seamless addition of the white light capabilities (although it offers no provision to mount an MRD directly to the unit).