Unfortunately, No. Though that sounds fun. :) Decker Widgets share a name with phone Widgets but they do different things.
If you wanted to use Decker's Widgets for your own personal use on your computer you could definitely make a small nice looking deck that holds Widgets that do small helpful things that you'd like to have access to on your desktop... (I'm imagining things like a clock, a to-do list, a pomodoro timer, a place for writing notes, etc.) but the widgets would still have to be entirely inside Decker.