No shortcuts as such, but in Photoshop you can have a floating launcher box, which can be set to open when you start Photoshop.
Actually, the plugins simplify complex editing, that is the point of them.They haven't got me. I have resisted, though it has been hard.
I have a long way to go before being truly proficient with Photoshop and Lightroom. Buying more software isn't going to help me in my quest.
The plugin will appear like this in Photoshop. Note that I'm using the older free version from Google.
You can run the software elements of Nik Collection as standalone. This article here explains it all: How to Run Nik Collection Standalone Without Photoshop or Lightroom