They have a folding optic mount that allows you to keep a red dot mounted and fold the 2000
I've seen the folding mount, and it is said to hold zero, but the I know that the Merritt I got, which has a quick release, also holds zero when remounted. That folding mount costs almost $100, while my two quick release mounts cost less than $20 each. The Merritt quick release mount I've got (with the SIG Romeo5 already on it) probably takes maybe less than a minute to mount.
With the folding mount I'm not sure you can easily move the mounted sight out of the way to use the factory sights on the gun -- which you might want to do if you have a dead battery or something goes wrong with the electronics. I don't know how hard it might be to take off the Sub-2000.
I've got another Red Dot system and it's mounted on the other quick release mount, but I've not sighted it in, yet. If it holds zero I'll have two two different red dot systems, both with sturdy quick-release aluminum mounts. I'll probably end up mounting the second sight system on another gun. Both the SIG Romeo5, another Red Dot, and the two quick-release mounts cost me less than a total of $160 delivered.
In theory, it would be nice to have a red dot sight that could be co-witnessed with the factory sights, but doing that would force you into a less comfortable position when using the factory sights. Higher factory-type sights would be the solution, there -- as the stock sights make you bend you head down awkwardly.
Ignoring the factory sights is the best path, as long as your other optical system works. A detachable Monte Carlo cheek rest (also using a quick-release or folding design) would probably be a big seller if it could be done in a way that doesn't interfere with the bolt handle as the gun is fired.