R100RT wrote:a small, remote located computer fan […] feeding a 1″ ID hose that develops very slight but positive pressure into a cover fitting

I had thought of something like that, but I was primarily considering the potential need to cool the enclosed ECU. That seems an excellent way to do both, provided of course that the intake to the fan is kept completely dry. Blowing water in that wouldn’t have gone in normally would be bad. The fan intake situated very high under the body, blowing through an S-trap would work very well.