Well you can go either way, but for the price, and what you get (small board with dc-dc converter on each) + two capsules from it for any project down the line CM60 is hard to beat.
Those boards you linked to all have some issues. Capsule to fet connection should be floating, and one leg of high value resistor.
The latest 3pc lot can be interresting for the price, but should be modded to regular schoeps with FET at Q1 and high value resistors, but it still lacks DC-DC converter, and has to be modded with typical bm800 mod for lower noise.
Edge terminated capsule won't give you correct emulation models if that's what you are going after.
The whole point with 797 capsule is that it's used in real Sphere, and is crazy consistent. The very reason they opted for it. You can ask for a sample directly from 797.
Capacitance consistency is not important, as it affects only output of the capsule in this case, and since the mic is dual output it's irrelevant. All the samples i got from 797 audio were in 3pF tolerance range. Certified with FR graphs 0° and 180°.
So, used B2 + two new cm60. You are looking about 100$.
Studio Project mics, old Rode NT2 (not A) has that capsule as well.