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decrepit said..
your first idea wasn't so bad, a sailing sup is a great way to learn, plenty of stability and can get you into the waves before the kiters go out. Then after that, for stronger wind you can get a smaller board
Most good learners boards aren't good in waves and you'll quickly grow out of it.
There is the option if you are indeed very fit, and not adverse to plenty of initial failures, you can learn the hard fast way on a board that will eventually become your light wind board. This method bypasses the normal start with uphauling method and goes straight to waterstarting, but you need good tuition, a lot of the stuff is counter intuitive. You need to have the right gear for the conditions and your current skill set.
But with the sup, you can start with small sail and uphaul, and be sailing on your first outing. But it can take a while before your are proficient, and you may need to unlearn bad habits you've picked up.
So at 87kg you'd need at least 130litres, but I know nothing about commercial light wind wave boards, I'll leave that to others.