I've had experience with that broken elbow thing so my recommendation is based more on overcoming the resulting anxiety.

I'd get the 324's because they give you an option of which side to use. I've got a pair of those (or equals) on my beater bike and I love them. I like the ability to hop on my bike to scoot up to the C-store in whatever shoes I happen to be wearing.

It's taken me 5 years to overcome the anxiety after my accident and I'm not sure I'm completely over it even now. I wanted to jump right back on that horse and start over right where I left off. It didn't work that way for me. I've had to crawl back a baby step at a time. I'd recommend riding the platform side when that's all that you feel like and trying the clip-in side when you're feeling frisky. Keep it fun and it will come.