I played K1 after K2, so by then I had a pretty decent idea what I was doing.
I simply ignored physical combat and focused my Consular on maximising the DC of my Force Powers, or in other words on making my Force attacks as irresistible as possible. I remember the maximum value I could get without seriously gimping all attributes other than wisdom and charisma was 47 DC, which gave me a very decent % chance of succeeding a Force Whirlwind on Malak (31 reflex save), after Breaching his Immunity of course. That, alone or in combination with Force Kill, could eventually bring him down while stopping him from cutting me into little bits of meat.
My favorite aspect of this whole business was being able to defeat Malak only using the Force, without resorting to stupid things like stimulants (Luke Skywalker didn't need no stinkin' steroids, neither do I), shields (ditto), medpacks (instahealing, wtf?) or mines (taking advantage of crappy AI doesn't make me feel powerful).
Anyway, so it was a single-bladed Scout/Consular, I went with the advice of Aeon's page and did a 5/15 level spread which gave me the most feats. I played Lightside, which let me use get extra DC from the robe, I think from the circlet, and from Lightside Mastery (funny how it never shows in K1 like it does in K2, but it does give you extra charisma).
My second playthrough was a Guardian, double sabers. It was tons of fun, but I think I needed to activate a verpine shield against Malak.