I hear ya. The rigid strap can be annoying sometimes. I think someone should consider making a single hole version with a fork on the other end, secured by lock wing nut. That would make it a lot less hassle to separate and exchange the battery while remaining rigid.
Take a look at the troy lee designs battery strap, its got a hinge on one side, and a post with a body clip on the other. I kept the hinge side and used a threaded post with a 2.0 thumb nut. Works great!