Instead of working with a field monitor, you may consider having a Zacuto Z-Finder attached to the back, unless of course you have multiple people that need to see the image you're recording.
I use Manfrotto 394 quick-release plates to attach my cameras to my tripods and monopods. You might consider the purchase of a cage (powered or non-powered if you have lots of things to connect.
As for the Zoom H4N - I carry it in my pocket with the receiver for the mic attached. You
do have to check regularly if audio is recording properly.
Richard van den Boogaard
cameraman / editor / video marketing consultant
Branded Channels
W:
http://www.brandedchannels.com
