OMG, I love you guys so much. I am sitting here with tears streaming down my face and laughing so hard I’m coughing!
I cannot be nearly as clever as everyone else, so I’ll just tell you what we did, and if you like any of these solutions, feel free to steal them.
I took my husband’s last name but changed my middle name (which I always hated anyway) to my maiden name.
We didn’t write our own vows, but my husband wrote a beautiful speech he gave during the reception. I ended up stepping on my tongue and forgot to even mention my husband in my speech, which obviously was completely unprepared! I did step back to the mic and say, “Oh yeah! And I love my new husband!” I recommend this only if you want to have a memory you can both cringe and laugh over. 
Everyone asked us when we were going to have kids, and while I agree it’s a very rude and intrusive question, I just said we were having fun practicing and it would happen if it happened. That usually shut people up.
Nobody asked me who we were inviting, but I’d be curious why the person is asking. Are they concerned you might forget about those people? Will they not show up if those people are there? I guess their motivation would determine how I answered.
My husband was totally opposed to “registering”, as it felt too much like asking for gifts, and he didn’t want to tell people what to buy – he wanted their gifts to be their own ideas. I was happy to bow to his feelings on this, until he finally got tired of people asking him what we wanted or could use, and he agreed that we would make our own “registry.” The compromise was, we could use item X, but we don’t want to dictate where to buy it, how much to spend on it, etc., so we just set up a website with links to various ideas; a fondue pot, cookbooks, a picnic backpack, good cooking knives, and so on. It worked great for us, but I don’t necessarily recommend it for everyone because it was actually a lot of work to create and maintain. But we were grateful for every single thing we got, whether on our list or not, and we still use almost everything we were given, 7 years later.
Mazel Tov on your impeding nuptials!