Well you -could- in -theory- craft some animations for a "shieldless" paladin. Lob could be throwing a rock (sling perhaps?), Bash would be a heavy gut punch delivered with the off-hand, Swipe would be a backhand... as for blocking, an armored gauntlet if shaped right can do wonders against enemy blades. Or... hell, could just throw in shirahadori somewhere.

... I guess what I'm really saying is "want a shieldless paladin? Wait on Yoshida and the gang to code up a samurai class/job. Please look forward to it! "