And here I am forever alone :p
Anyway, did this, should work fine for whichever way I wish to go ahead, either breather / drain to atmosphere, or some kind of positive pressure arrangement.
http://www.aulro.com/afvb/attachment...1&d=1474982805
http://www.aulro.com/afvb/attachment...1&d=1474982805
1/4 BSP threads I installed are rather versatile for a range of pneumatic gear, so should not be left stuck for options.
Disregard all the RTV sealant everywhere, I sealed it up good, but waiting for it to cure before final clean up.

