Heater Bubble/Drain Redesign

Hi all,
 
Whilst I know that the heater bubble repair topic has been covered at length, these all seem to keep the same design - essentially just repairing what's already in place.
 
I'm interested in changing the design of the heater bubble drain, so that the water run-off doesn't splash onto the motor whilst running or pool on the head when stationary. [A long story short, I was recently reunited with my car - listed here and it appears to have significant amounts of rust on the head, near the rear two spark plugs].
 
So, I've decided that the motor needs to come out again as I want it looking like this again and when this happens, I'm committed to changing the water drainage from the heater bubble. I've read some things about internal drains and know that Ford originally had a plastic drain pipe that went into the heater bubble drain hole; but I'm interested in hearing what others would do in this situation? What would you consider to be the ideal solution to:
 
* Allow water run-off,
* Not have it drip onto the engine, starter motor, etc.
* Not get clogged or require regular maintenance.
 
Much appreciated in advance.
 
Diskonekted

Hi Marty,
 
Thanks for the picture and response. I can't quite tell from the picture, but is there an opening for the water to drain out of? Or is that handled by an internal drain?
 
Cheers,
Diskonekted

Hi the drain slot goes from one side to the other.. but is only about an inch high at the middle.

Also paint all the inside of the bubble/cowl with POR15 to make it bullet proof