Nope I am afraid you are wrong. Sor Blade Chan feat gives you the ability to use any ranged attack as a melee attack with a range of melee with your dagger..i.e. not provoking OAs. Just because one your powers is a RBA doesn't mean you can use it with Sor Blade Chan it morphs into a MBA, is is (as the feat says) a melee attack only.
Sorry
???
I'm going to ask you to clarify the wording of that last bit; you lost me somewhere in the details of the syntax.
To clarify my original thought:
1 - Acid Orb is a Sorcerer Attack Power (SAP).
2 - Acid Orb carries a special feature that it may be used as a ranged basic attack (RBA).
3 - As far as I can tell, this RBA is still Acid Orb and carries all the effects, keywords, etc. of that power; i.e. it is still a ranged SAP, has implement, acid, and arcane keywords and does NOT have the weapon keyword of RBA.
4 - Sorcerous Blade Channeling (SBC) allows a ranged SAP to be channeled through a dagger and be used as a melee attack.
5 - Therefore, the RBA SAP "Acid Orb" becomes a Melee Basic Attack Sorceror Attack Power.
Are you indicating that you read Acid Orb to mean that it becomes an RBA just as it is written on PHB 287, and therefore Acid Orb is somehow no longer a "Sorceror Attack" power but only and uniquely a "Basic Attack" power? (If so, be careful; this could open up an argument that Acid Orb (and Magic Missile and Eldtritch Blast) used as an RBA have the Weapon keyword, and that a sorceror using EITHER a dagger or staff would always be best served to use Acid Orb as an RBA and get the proficiency bonus to hit; somehow I don't think this is RAI.)
Are you indicating that Acid Orb used as an RBA SAP and channeled through a dagger with SBC is a melee attack, but somehow no longer a Basic Attack?
Or are you indicating that Acid Orb channeled through a dagger with SBC is becomes a melee attack that can be used as a ranged basic attack?
So I guess that my read would modify my list above:
3.5 - Acid Orb used as a Ranged Basic Attack is both a "Basic Attack" and a "Sorceror Attack" power.
Overall, I don't think this would be terribly overpowering; most Sorcerors probably don't want to linger on the skirmish line long enough to take OAs or be a TacLord's poke buddy.
-Dan'L