In Ultraschall.FM (a Podcasting Template for Reaper) you can implement a soundboard as VST-Plugin and a ducking automation as VST either. For producing a live-podcast in Hindy this would be nice to heave.
On macOS, I use a separate soundboard application like Farrago in conjunction with Audio Hijack and Loopback.
I'm sure there are Windows equivalents.
After some research I found out that soundboard is a 64bit AU/VST plugin you can download from the Ultraschall website. As far as I know Hindy accepts 32bit plugins only. To use soundboard you need an instument track which is not available in Hindy. One instrument track per session would be enough for inserting audio clips in live podcasts. Maybe there is some way to implement this feature.