Cousin_it's link is interesting, but it doesn't seem to have anything to do with OAI, and instead looks like a possible method of directly building an FAI.

Of course the model "OAIs are extremely dangerous if not properly contained; let's let everyone have one!" isn't going to work.

Hmm, maybe I'm underestimating the amount of time it would take for OAI knowledge to spread, especially if the first OAI project is a military one (on the other hand, the military and their contractors don't seem to be having better luck with network security than anyone else). How long do you expect the window of opportunity (i.e., the time from the first successful OAI to the first UFAI, assuming no FAI gets built in the mean time) to be?

some of these things will be experimental

I'd like to have FAI researchers determine what kind of experiments they want to do (if any, after doing appropriate benefit/risk analysis), which probably depends on the specific FAI approach they intend to use, and then build limited AIs (or non-AI constructs) to do the experiments. Building general Oracles that can answer arbitrary (or a wide range of) questions seems unnecessarily dangerous for this purpose, and may not help anyway depending on the FAI approach.

And there seems no drawback to pushing an UFAI project into becoming an OAI project.

There may be, if the right thing to do is to instead push them to not build an AGI at all.