Hi Strat919.
I struggle to see the point of using a wing board with a kite. A simple cheap kite foil board will make kitefoiling much easier. In fact a board with minimal volume will make kitefoiling easier by providing more resistance against the pull of the kite as it sits deeper in the water. This is important in light winds as any drifting towards the kite reduces your effective wind speed. The other advantage of a small kitefoil board is much better pumpability which will help a lot in light winds especially as I assume you are using large wingfoil front wings.
The Peaks are great kites for light wind foiling but if you're learning to kitefoil with them, especially with a large and voluminous board, I think you'll drop them and have to swim in and reset. The Hybrids will help in this situation for relaunch but when you've got your skills up the Peaks are great with a lot of controllable power for their size. I use both and find them quite similar to use with more top end with the Hybrid and more bottom end grunt with the Peaks. I was out yesterday with a 5m Peak5, my light wind kite

, in winds around 6-8 knots. Had to work the kite hard in the lulls when getting out of the water but once foiling the apparent wind made it easy on a high aspect 840 sq cm foil. Gybing was challenging as timing was critical to keep line tension to avoid kite collapse and get the board turned quickly to keep foiling. I weigh 67kg which helps.
As for flying a 6m Peak5 in a field, as long as it's not over 20 knots you'll be fine. Use common sense and allow plenty of room. Use the 21m lines and remove the B-Safe lines for water use and some land use as they'll only create unnecessary tangles as they are so fine. You really only need them for snow kiting so you can stop the kite pulling you off a cliff or similar. Remember when you crash a Peak it collapses with no power or structure and will stay that way in water unless you take immediate action to relaunch.
Keep your bridle lines neat and keep the ends of the bridle lines/or bar if you leave it connected, away from the kite bridles and you'll have a kite which is faster to set up or take down than anyone else.