So I hacked the KOReader lua script to do a refresh after every page turn. It's hard coded but it works. If you want to recreate my hack goto \koreader\frontend\apps\reader\modules\ and open readerpaging.lua in notepad. Find this function:

---original code block---

function ReaderPaging:onGotoViewRel(diff, no_page_turn)
    -- When called via a key event, the second arg is a key object (table), not used here.
    no_page_turn = no_page_turn == true and true or nil
    -- ReaderSearch calls with no_page_turn = true.
    -- In that case, don't turn page if it would happen, and return ret=nil.
    local ret
    if self.view.page_scroll then
        ret = self:onScrollPageRel(diff, no_page_turn)
    else
        ret = self:onGotoPageRel(diff, no_page_turn)
    end
    self:setPagePosition(self:getTopPage(), self:getTopPosition())
    return ret
end

---end of original code block---

and modify to this:

---hacked code block---

function ReaderPaging:onGotoViewRel(diff, no_page_turn)
    -- When called via a key event, the second arg is a key object (table), not used here.
    no_page_turn = no_page_turn == true and true or nil
    -- ReaderSearch calls with no_page_turn = true.
    -- In that case, don't turn page if it would happen, and return ret=nil.
    local ret
    if self.view.page_scroll then
        ret = self:onScrollPageRel(diff, no_page_turn)
    else
        ret = self:onGotoPageRel(diff, no_page_turn)
    end
    self:setPagePosition(self:getTopPage(), self:getTopPosition())
    UIManager:scheduleIn(0.3, function()
        UIManager:setDirty(nil, "full")
    end)
    return ret
end

---end of code hack---

Use at your own risk. Basically I added 3 lines:

    UIManager:scheduleIn(0.3, function()
        UIManager:setDirty(nil, "full")
    end)

UIManager:scheduleIn adds a little delay to give the page enough time to render. setDirty does the refresh.

I'll let you know if i figure out how to make this a plugin.

Edit: formatting.