I have multiple ODD Caddies with HDD/SSD mounted inside them and I hot swap them to boot different OS-es. I have a separate caddy with a SSD for MacOS only. When I start my computer, I press ESC key until boot selection comes up and I just select the MacOS SDD to let Clover load.
This is how I roll. Caddies bought from ebay for $6 each, HDDs/SSDs of small capacities bought for easy testing for some ridiculous low prices.