Having lived in Texas most of my life and having killed a boat load of Javelinas, I can honestly tell you it's not worth the trip and expense to come just for that one animal. It's completely your call and your money but my suggestion would be to tag it on to something else like an exotic, whitetail, etc.

I'm not trying to poopoo your plans, just don't want you to be disappointed. They are super simple to hunt and kill. They usually travel in large packs and when you see one, you see 20+. When you shoot one, they run off and then come back 2 minutes later. When you shoot your 2nd one, you are done for the year.