Crankcase ventilation
I'm not sure what you mean by "base" breather hose but placing the end of the breather hose in close proximity with the engine air inlet is a good thing to do. A diesel engine sucks in so much air that a little from the crankcase wouldn't be noticed. In fact, many of the Universal diesels have a clip alongside the air inlet that holds the end of the breather hose. I wouldn't recommend putting the breather hose in a blower hose, nor would I recommend running the blower while the diesel is running. The discharge from the breather hose would put an oily coating in the blower and anything connected to it. Since a diesel uses so much air, it would make more sense to push air into the engine box, rather than try to evacuate it. Granted that there is a second hose that should allow air back in but I feel that the net result would be a lower pressure within the engine box.