You could rock a high agility build, and split ur wpf into someting like 121/121/100something. You'd need to convert some points, and have 12 strength. I'm trying this out for a native american build thing, using 1h, spear, and throwing. I'll let you know how badly it works out.
It sounds like you want to be able to ride horses, but also like ranged combat. You mentioned enjoying 1h weapons, 1h/shield, and xbows as well. You could go for a 1h/xbow hybrid, with points in riding. But, you won't be able to one shot people or use your arbelast on horseback. You don't wanna waste the arbelast though, so maybe make a cav alt.
You might like a 1h/xbow build. If you want you can put 3 or 4 points in shield skill, but due to the slot system you would forced to use a regular xbow (or weaker), for the arbelast takes 2 slots.
Really, if you want to use an arbelast and carry some other weapon, that other weapon would have to be a 1h due to the slot system.
