Nice idea and excellent execution!
We discussed this with our ash pan manufacturer and these were already a design used by Alaska years back (his dad owned the company when it first started). We will make them available if there is enough interest, our design will have probably only one handle as the Harmans currently do. Seems to work pretty well.
We can always make a kit available to upgrade your existing ash pans, then you can transfer them from one to the other as the pans are replaced. As is always the case there are a number of ways to improve on what is currently being sold.