setting v:searchforward from a motion operator

I am creating an operator mapping that sets the selection register based on the user's motion. e.g. =*iW to search for the current cWORD and stuff like that.

I would very much like to be able to set v:searchforward as part of this, but it's not clear how I can do this. Per :h function-search-undo, any value assigned to v:searchforward inside of a function is undone when the function returns. I can work around this most of the time, but not when doing an operator function using g@.

The mapping is implemented essentially like this:

nmap <silent> =* :<C-U>set operatorfunc=SetSearchPattern<CR>g@

This function sets the search pattern @/ and does a couple of other things. If I set v:searchforward inside it, the assignment is ignored.

I have other mappings that invoke this function then set v:searchforward in a separate exec statement:

vmap <silent> z* :call SetSearchFromSelection(visualmode())<CR>:let v:searchforward = 1<CR>
vmap <silent> z# :call SetSearchFromSelection(visualmode())<CR>:let v:searchforward = 0<CR>

But I don't know how to do this in conjunction with g@, since what comes after g@ is interpreted as a motion.

Any suggestions for how I can get around this restriction?

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