For sure you can learn on that gear...I did and I'm no prodigy.
This is what'll happen though: at first, you'll try to water start like a TT and you'll get ejected. Then you'll get up onto the board and edge up like a TT and get ejected. Then you'll get up on the foil and while you're figuring out the balance, you'll get ejected or worse, jackknifed.
You're going to get ejected a lot
A short mast will limit your ejections to breach n' splashdowns, and a high-volume board will make it easier to stay on the board between kite power strokes.
So now you know roughly what you face...
These are my solutions:
1. When you water start, aim the board way more downwind than normal, sink your back foot to resist the kite and lever yourself over your back foot to slam down your front foot. Imagine dropping into a halfpipe on a skateboard.
2. Ride the board flat on the water, keeping your weight over your front foot (yoga side lunge or bend your front knee) and stand upright with relaxed knees. Imagine you're an extension of the mast: a straight line between the fuselage and your head!
3. Ride the board flat on the water (yes again) and turn your head & shoulders to look upwind -- your ass will follow, and so will the board.
4. Ride the board flat on the water (got it yet?) and let your board speed increase with power in the kite. The foil will fly when you have enough speed, and you must keep your weight forward so the foil will just clear the water.
5. Keep doing number 4. When you can skim the surface easily, you can probably ride with the mast further out...
You initial goal should always be to ride the board flat on the water. Any attempt to hop the board up on the foil will result in an ejection, because you haven't got the muscle memory yet to balance on the foil.
This is why you want good clean, reasonable wind and not a tiny kite:
You want enough wind so you can ride without fighting to keep the kite in the sky and can just sheet in for power, but not so much you get pulled off balance. I found that if you can body drag ok but would feel underpowered on a TT, you're probably right.
You want a small/fast enough kite that you can stroke without waiting for it to climb but not so small you have to work it all the time for power. I found 10m in ~15 knots perfect.
Final points -- getting away from shallow water is hard. Learn to body drag or for the first couple of sessions, get a ride way the hell upwind of your beach.
Limit your sessions to about an hour; they're very tiring and getting body slammed every minute wears you out.
Don't get back on your TT (especially not in the same session!) until you can comfortably get on the board and keep it on the water. Maybe 3 sessions.
You probably need to ride faster than you would on a TT. It's actually easier to control the foil with more speed...