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).