Lions Arch portal stone
First off all, do not use WvW to go to lions arch but the hearts of the mists. Going through WvW means you might be taking someones spot for a brief moment and your not doing your world a favor cause you pressence counts for the underpowered buff.
You can easily go to the hearts of the mists using the two crossed swords. You have to do a tutorial once, but after that you are directly in front of the portal to la.
As for your suggestion, it is a good one but it won’t happen. Waypointing is a moneysink. By bypassing waypointing and making it easier (one loading screen instead of two) more people will use this method instead of using a waypoint.
Arise, ye farmers of all nations
Arise, opressed of Tyria!
Arise, opressed of Tyria!