Collection Strategy at Operating Unit Level

 Hi,

We are on Advanced Collections 11.5.10.2 release. We have a requirement where an operating unit using Advanced Collections wants to send the correspondence letters at Account level and hence the strategy has been defined at "Account" level. But there is another operating unit that wants to send the correpondence letters at Bill to Level.

Is it possible to define one strategy at Account level for one operating unit and one strategy at Bill To level for the other operating unit? I believe its not possible to do this, is there any other customisation that we can do to achieve sending correpondence letter at account as well as bill to level using single strategy at Account level?