Update: I went to attach EZ Flate hyperflex hose with their Rapid Locking Air Chucks which are apparently compatible with Apex RPV valves and found that the standard length Apex RPV actually cause the stem to sit too far buried inside of the RR7 lip/well to allow some air chucks to grab on.
There is about 3.5 - 4 mm of clearance between the valve stem and the "lip", pictured.
My EZ Flate Rapid Locking Airchuck is far too wide to fit between the lip and the valve stem. I imagine the solution would the the XL length, since they may be long enough to protrude past the lip and allow an air chuck to grab on. but maybe someone else can weigh in?
Until we get answers, I might try a schrader hose extension as a quick fix, even if it limits my air chuck's quick connect ability.