Since kiteingadventure is only 60kg, he or she can do this more easily than some -at least for light to medium conditions. 30-35L should be enough volume to paddle pretty easily at that weight, and can be had in a pointier shape allowing the desired beach pose -if that matters
But if you are in the never-ever-surfed-before category, you will want some sessions on a 8'+ long board first. If not wanting to own own you can maybe borrow it rather than buy. This is just so you can float around and see the line up, learn how rips or channels work, how to work your way around a break. Try to start by following a friend around the break. The knowledge you gain will save you from paddling the entire time you are out, learn how to stay out of others' way, and increase fun and safety.
Once you know how to put yourself where waves will break under you, you can move down to a smaller board -just not the tiniest one around.
So maybe even the bigger RRD could work, certainly a potatonator, dominator or celeritas might, anything over 30L.
The rider's light weight also means less risk of breaking a traditional surfboard right away.
because of this, if on a budget, you could go for any available used short surfboard geared to beginner/intermediate level.
A fish or "grovel" shape board would be good.
A quad fin fish is pretty much the easiest board to learn to jibe and most of them go upwind very well.