agreed.
Either that or buy the funnels separately, and in order to use them on an ally it takes 1 pot, 1 funnel, and within 5 feet.
That way It would still be true to the dnd rules, where you COULD poor a potion down an ally's throat if you wanted to.
However, I also believe that if you FAIL the disease DC as a FIGHTER, where is your con at? Same for poison. And at any rate, drink the one with the shortest hit-time first. Drinking remove curse first is never a good idea unless you have mummy rot.