I used to think that about starting on a twin tip, I actually made one a couple of years ago, short coarse and upwind no to many issues, but downwind and big waves a problem with a big flat twin tip going fast, remember your not in flat water.
If you wanna get into racing then using a twin tip is only delaying the inevitable, bite the bullet, come up with your race board and just doit, the sooner you start learning the better, you have a month, that should be enough time to practice and get at least 30% of your tacks and gybes.
Remember on an upwind beat from the start line you may only do two tacks to get around the top mark so while it is important to do them good, it's not the end of the world, the bottom half the fleet will be falling of on some tacks and even the pointy end will still fall off from time to time.
At Sail Brisbane at easter we had all levels of skill and everyone had someone to compete with around the course and we all had a great time.
Most came away with something learned and something to learn and a little better for the experience