Modification to Countdown Clock Plugin

I need to modify the T(-) Countdown plugin for WordPress (or create something from new) with the added functionality for the clock to automatically pause on non-business days (holidays and weekends). The holidays and weekends need to be selectable in the plugin settings. The clock should display in the top right corner or right widget area of this website >

Also, I need to make some small modifications to the clock design/stye, size, and mobile formatting.

Here's a conversation I had with the plugin developer >

Plugin developer has not responded so I hoping to connect with someone in WPMU that would be interested in helping or at least point me in the right direction.