I think you are generating a straw man argument here.
The old Mauser calibers are not "intermediate" by anybody else's definition.
OAL of the 6.5 Swede is listed in CotW as 3.15", the 7mm Spanish Mauser at 3.06", and the 7.92x57 at 3.17". These are baseline standard length cartridges; the .30-06 is the overgrown oddball among major military rounds at 3.34" and you see things like Mausers with notches in the receiver ring to clear the nose of the bullet.
The .30-06 being the US standard, along with descendants like the .270 and the "short magnums" made to fit .30-06 magazines, you will find nearly all current guns that .17" or so longer to handle it/them.
There are a few Mausers still in production, Zastava still makes what was best known here as the Mk X. Of course it will handle .30-06 but that is the adaptation with a longer magazine, etc; it is the same receiver length as any '98 Mauser originally designed for the 8mm.
So the answer to your question is, no, nobody makes an action dedicated to the 6.5, 7, or 8mm Mauser cartridges. It is just not economically feasible to tool up for one.
Better a slightly long action than a short one. The 6.35x57 (usually known as the .257 Roberts) was hamstrung by being chambered in short action (or shortened action) rifles. A common modification to the Winchester Model 70 .257 (a "long" action artifically restricted) was to put in a .30-06 magazine follower and bolt stop so the round could be loaded to 3" OAL. Even lengthen the chamber throat to allow 3.3" OAL to put the base of a 117 gr spitzer in the case neck instead of down into the body.
