If we're really going to take that approach, then I would at least limit it with the "you don't count as being in close combat unless you began your turn in close combat" aspect for attackers.
This is from errata for B392's "Defence in Close Combat" (can't block, only reach-C weapons can parry) at
http://www.sjgames.com/gurps/faq/FAQ4-3.html#SS3.4.3.6 which modified the BasicRAW to be way less brutal by adding this:
On a turn when someone enters close combat and tries to attack or grapple you, you can defend normally as if you were not in Close Combat
MA117 (Long Weapons in Close Combat) seems to imply something along those lines except it's even better (also counts if attacker began turn but you have room to retreat):
This doesn’t affect parries made as your foe enters close combat.
Likewise, if you’re able to retreat out of close combat, you get your full Parry plus the usual retreat bonus.
The penalty for parrying only seems to apply if the foe BEGAN his turn in close combat (not if he entered it on the very turn he launched the attack).
So perhaps in the same way (attackers don't benefit from penalizing their target's parry if they just approached) a Judoka doesn't get to use his higher-than-DX skill if he just entered close combat that very turn?
This would at least stop Judoka from doing amazing running punches.