One question. Isn't everything on Real UI related to the scale of UIParent?
That way you could just increase the scale of UIParent. Either by using the system settings (enable ui scale and move the slider) or by using this in chat.
Lua Code:
/run SetCVar("useUiScale", 1)
/run SetCVar("uiScale", 2) --add your scale here. 2 makes everything twice as big as default
Now that I think about it...That is probably why Blizzard introduced the bigger nameplate option. Nameplates are part of the worldframe and are not affected by the scale of UIParent by default.