How about this: In some phase of getting guild levels, player could choose
would he/she like to specialize in different martial arts, or just continue
normal training and take levels as it is now.

If player wants to specialize, he would have to take levels slower and during
that, complete a series or quest/tasks. Each martial art could also have one
player as the guildmaster... Each quest should be doable by the monk alone.
They could take some time, but should not be like rangers torch 1000 etc...

T The subguilds would be (only examples): Tai Chi -giving the monk better
offensive skills at least... perhaps some oother stuff that has to do with the
spirituality part.

Aikido: This one could give the monk an ability to use sblades and staves as
weapons. Monk should get also skills that would use those weapons. Only
limitation would be that the monk could use only one weapon, so the other hand
would be free for martial arts moves.

Shaolin Kung-Fu: This would be the most defensive of subguilds. Perhaps that
unarmed parry could work only in this one. They should also get some physress
or other stuff that shows the endurance these monks have.

Drunken Boxing (not sure what the chinese name is): This one would be mostly
offensive, but should also give the monk better working contact reflexes, or
other skill that would reduce damage, since Drunken Boxing is very smooth and
more about giving in than opposing enemys strikes. These monks could also gain
some bonuses when they are drunk! Of course after being drunk, the effects
should be opposite for a while.

Hope you like this idea! Would certainly add a lot of flavor to monks. These
subguilds are just something that came to my mind. Other ones could also be
possible...

- Tsuran Windforce, after many Jackie Chan and Jet Li momvies...