hey , i know your kidding , i was emphasizing how slow im am , if i was building them to sell id make templates and have about five drills with each holesaw ready to go etc , i could get fast then .
You have an Airflex pro ? yeah fabricating a metal manifold for the two 6.6s should be easy enough . You just need to measure where the two holes are going in the new metal plate ., and the six bolt hole positions . if you have some downtime , perhaps buy two 6.6s first and place on the existing manifold , buy moving them around you should find a good position and mark the holes , you could then either remove the existing manifold and take it along to a local metal fab place and say make me this with the holes here . Or you could make a cardboard copy .
Wiring wise ... you just need to add a second cord , buy a cable gland like the one already on the machine to hold it tight , you could opt for no switch if its easier , like just plug it in and it comes on .