I think that one might require yakety-saxing your way through the bandit tunnel for the poison coating, a bunch of mana stones, a slime companion, thunderbolt and lightning blade.
Nah, I think you could theoretically get it done with Pierce, using an Energy Potion or two and praying to RNGesus that Tactical Advantage always works. Might work out once every 20-50 fights? Not saying it would be fun, just possible. Ed: Though now that you mention it, Lightning Sword would be a good option for TA without constantly draining your MP. Pretty sure you could handle the goblin even if it outspeeds you, too.
Ed 2: Nevermind, at least if I'm trying to limit myself to 46 score using Lightning Sword seems a bit rough. Not entirely without merit, but rough nonetheless, as there's really only 14 points to work with afterward (+3 AGI is necessary for outspeeding the commander).
That run ended at 30/34 corruption and enough gold for holy water, I'm operating under a 50 point budget assumption. Run 2 is probably going to end with a higher score anyway.
Could it be an idea to +2 the AGI, use a vitality potion after the duels, kill the Goblin Shaman first for Albrecht's ring and the level 2 stat increase before going Ogre Commander?
I tried noodling around with a few different builds, but at least from what I was seeing it's hard to reconcile the skills needed for Goblin Shaman vs. Ogre Commander while staying within 50 Score and having Lightning Sword, at least in Nightmare. Going over it, I still think your best bet for beating the Commander Day 1 within 50 Score is going to be +3 ATK and Storm, which should let you drop the AGI requirement, allowing you to potentially go with +3 DEF (helps with dueling Quentin, though you can still lose with low damage rolls) and Slash/Pierce, +15 HP/MP, or Fire for extra area access.
In this scenario Slash makes it possible to beat the Goblin Shaman, but only if he brainfarts and attacks you (once, missing on a TA dodge) rather than casting Fire (twice), whereas Pierce lets you deal 40~50 more damage per critical hit to the Ogre Commander (at Lvl 1, anyway), and Fire gives you access to more materials and thus a higher potential max MP.
Of course, any way you slice it beating OC on Day 1 w/o Collar is going to require some measure of luck even if you are pulling out all the stops with skill loadout. Speaking from experience, there, as I've had that bastard hit me more than my fair share of times through both Tactical Advantage and Blindness.