Welcome, Karl! Well a name is something important to you, and it has to feel right. For me, the name I decided to use, “Amy” just came to me one day when I was dressed up. I thought of a number of other names, mostly of women I have known at one time, and thought attractive, but somehow Amy seemed to be right. For some reason only known to my subconscious.
Karla would be a good choice as it’s close to you male name, or you could take other spelling of it, with a “C” for Carla. Either one is a well known and recognized female name, if that’s important to you. If you get out in the world en femme, it would also help as if someone says “Hey Karla….” you’ll pick up on it much better than a totally different name.
Though as I said it’s totally up to you, and you have to feel it’s right for you.
Otherwise this is great website, very accepting no matter where you find yourself on your journey or however you may identify yourself.