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I need the boot manager at startup every time. I have a 2014 mini with 2 bootable partitions. Yosemite on one and Catalina on the other. Obviously, need to run legacy software.

When running Yosemite, the Catalina drive doesn't mount. So it can't be selected as the boot disk from within Yosemite.

The wireless keyboard doesn't interrupt the boot sequence for keyboard shortcuts to work.

Haven't found a third party boot manager to work in this setup and a wired keyboard doesn't suit the workspace.

I have the "sudo nvram manufacturing-enter-picker=true" saved to a text file. Too much to explain to the user,"open terminal, cut, paste, etc."

It would seem that this would just be a line written into a file but which, where, how?

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You could install the rEFInd boot manager so rEFInd could be selected from the Startup Disk pane of Yosemite's System Preferences. The rEFInd boot manager would need to configured to automatically boot Catalina.

To change from Catalina to Yosemite, you would select Yosemite from the Startup Disk pane of Catalina's System Preferences.

rEFInd can be downloaded used for free.

You could also configure rEFInd so the version of OS X (macOS) to boot would be determined by just a line written into a file.

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