Nah, it's never too late. You have 8 levels spare, which makes it ideal for 6/2 split.
6, because 1st tier of prestige enhancement comes at this level. And at 2 you
get evasion.
First of all, you can take 6 levels of ranger to make up for the loss of capstone,
1st tier of tempest ranger gives you +10% attack speed all the same.
This is only worth considering if you're TWF, and would cost you a LOT to
respec your TWF/ITWF feats as ranger gets'em free. Or you can just suck it
and lose 2 feat slots. You get a favored enemy feat(s? can't remember if it's 1 or 2),
can use some divine wands and get to cast longstrider and/or ram's might (+2 str which
stacks with bull's).
If you're THF, go take 6 barb and have ... Speed enhancement. Rage. FUN
Heck, as far as I'm concerned, take 6 wiz and spam blur/haste/fireball.
Just be prepared to use DP clickies and... no. On the other hand just don't
For the two levels, generally a monk or rogue is recommended. Both give you
evasion. Monk gives you wis bonus to AC, provided you run in clothing rather than armor.
Taking rogue at anything other than 1st level is an idea so bad, that even me, having an
open mind and all that find it very hard to suggest.
Anyway, just poke around the forums and look for 12ftr/splash/(splash) builds,
there are plenty. Just be careful, and read cautiously around what strengths
they're built. SInce you haven't planned your stats for the split, and haven't taken
the splashes early, they won't be that easy to adapt. But it certainly can be done.
Just weight what you lose and make sure what you gain makes up for it.
Taking 6rgr you can make up for the loss of 10% attack speed.
But how will you make up for the rest? Kensei is one of the few tier 3 enhancements
actually worth taking...
Experiment. If something goes wrong so horribly you'll just have to delete this char...
Delete it. Start anew, wiser. Have fun.
Cheers.