I posted about the exact same thing in my post here:
_{https://steemit.com/steemit/@omitaylor/idea-steemcommerce-buy-button}

Great minds think alike.

I may have a pseudo-solution ready. I can share it soon.

I've been working on some things but alas, my delegation is up and my VP is back down. Added to the recent dropped blocks and bandwidth issues, my testing is limited. :(

Soon. Soon.