oUF Test Mode for Header Units

[Rainrider]

I'm trying to figure a way to test header units (there are several threads on the issue, but they seem outdated and I wasn't able to find a solution there). So I though I'd just use oUF:SpawnHeader and feed it the same code I use to create the headers in oUF:Factory and alter is a bit so it just displays when I'm solo. This is what I got so far:

SLASH_OUF_RAIN1 = "/raintest"
SlashCmdList.OUF_RAIN = function(group)
    if group == "raid" then
        local raid = {}
        oUF:SetActiveStyle("RainRaid")
        for i = 1, 8 do
            local header = oUF:SpawnHeader(
                "oUF_Rain_TestRaidGroup"..i, nil, "solo",
                "showSolo", true,
                "showRaid", true,
                "yOffset", -7.5,
                "oUF-initialConfigFunction", [[
                    self:SetWidth(64)
                    self:SetHeight(30)
                ]]
            )
            raid[i] = header
            if (i == 1) then
                header:SetPoint("TOPLEFT", UIParent, 15, -15)
            else
                header:SetPoint("TOPLEFT", raid[i - 1], "TOPRIGHT", 7.5, 0)
            end
        end
    elseif group == "party" then
        oUF:SetActiveStyle("Rain")
        local party = oUF:SpawnHeader(
                "oUF_Rain_TestParty", nil, "solo",
                "showSolo", true,
                "showParty", true,
                "maxColumns", 4,
                "unitsPerColumn", 1,
                "columnAnchorPoint", "LEFT",
                "columnSpacing", 9.5,
                "oUF-initialConfigFunction", [[
                    self:SetWidth(110)
                    self:SetHeight(22)
                ]]
            )
        party:SetPoint("LEFT", UIParent, "BOTTOM", -231.25, 130)
    end
end

This only displays one unit per header though. Is it possible to display the player for every child of the header?