Ditto and Ditto
I come from a surfing background too and other than the initial learning curve of getting up and plaining and going upwind learning strapless is actually very very easy. I've been kiting for under a year (admittedly I have become completely obsessed and spent almost every singly windy moment i'm not working with a kite in the air) but i am now confidently riding strapless on waves, gybing and getting out through the whitewater without losing my board too often!
Plus as a surfer you will quickly find that you will not enjoy the feeling of your feet being strapped to the board once on the wave face. You make far more micro adjustments with your feet than you realise. I also went through a phase of riding strapped and tore my hammy of my front leg when my back foot ripped the DIY inserted footstrap out the tail and I did the splits on my board.
Simple thing I learned the hard way:
1) Don't try in really gusty conditions to start off with
2) you need to be less aggressive with your kite otherwise you just get pulled off your board and use your kit to lift you up over oncoming waves
3) make sure you initiate all turns and moves with your kite before you turn your board
4) be confident with your footwork and commit to the turn (I must admit I do still get stuck halfway in that awkward feet together stance)
5) No matter how tempting it seems to use one, NEVER use a board leash. I did because I thought it would save me time body dragging to get my board and sure enough in one session alone I got pinged by my board and on a separate occasion it went between my lines resulting in a very dangerous situation while i struggled to release the leash from my foot. Also it completely messes up your footwork.
6) Get yourself and dedicated kitesurfing surfboard - I trashed several of my conventional surfboards before buying a F-One Mitu pro which is not only 10x easier to ride with a kite but it doesn't get a massive hole in it every time you fall onto it spreader bar first
Enjoy the strapless freedom