I'm really amazed that you have been windsurfing for 18 years and haven't learnt how to waterstart. Waterstarting is a very valuable core technique that is actually quite easy to learn (and I was in my late 30s when learned to do it).
In fact, I learned how to waterstart the first day I attempted it, and I had no difficulty doing it on either tack. It was like a miracle when I first did it, and it was so easy. However, I had been sailing a longboard for about a year and a half, so I had developed reasonably decent skills. It was only after I bought my first short board did I try to waterstart.
Do yourself a favor and learn to waterstart ASAP. Ultimately you won't regret it, especially since you'll be able to readily take advantage of your new Futura 122.