After I got my Tangerines, I tried that.
And it makes a horrible frankenswitch. 
I really hoped that it would work, because this combination would have the perfect looks for my theme build, but I can’t stand the feel of this frankenswitch.
The first press on that frankenswitch feels quite close to the stick-and-slip effect, but only close.
It would be very odd since the housing and the stem are of different materials, and both the original Tangerine stem and the Healios stem are made of POM anyway.
That “almost-like-stick-and-slip”-feeling stays the same even after lubing.
Strangly it’s only the first press after the switch has not been pressed for a minute or so.
Took me a while to figure out the cause, but I believe I found the culprit.
The upper dampener of the Healios stem only just about fits in gable-like shape in the upper housing of the Tangerines.
If you continuosly press the key it feels ok, but if you give it some time, the dampener slightly wedges/james itself in that gable-like shape.
I believe this is the cause for the strange “almost-like-stick-and-slip”-feeling.
A pity, really…
Maybe I try lubing the gable-shape and see if that helps…