In my previous post I tried to give detail explanations how wield command are supposed to work. At first glance it may look complicated (though actually it is simplier than the current system). So now I feel that is also useful to give overview and some clarification to my proposal.

First of all, metacommands described in my proposal are virtual commands. They can be mapped on real commands the way implementator is choosing.
For example, "primary" command may be implemented as "wield"
and "offhand" command may be implemented as "dual".

Below I will give some quick comparison for my proposal vs. the current system so you would see that proposed syntax is not more complicated.

My proposal        What is does     Current system
primary <weapon>   wields primary    wield <weapon>
offhand <item>     wields offhand    dual <weapon> or wear <item>
remprimary         removes primary   remove <weapon>
remoffhand         removes offhand   remove <weapon/item>