Holding the F11 down did the trick, thanks! I can now reliably get into the Clover boot menu when I need to yet still boot directly into macOS at all other times!
I'm curious; when you boot into your Hack, do you also bypass the Clover Boot menu?
I suspect that leaving the Default Boot Volume blank would also bring me to the Clover boot menu, as that is essentially what I was doing by unplugging the last working HDD. I had previously set the Timeout number to "-1" which is supposed to be no timeout, so I don't think that increasing the number would have helped.
I've tried other EFI's on this Hack and yours is the only one that bypasses the Clover boot menu completely and goes directly to the Apple boot logo. Could that be happening because of one of these Boot arguments in the config.plist?
<key>Arguments</key>
<string>-alcbeta -lilubetaall debug=0x100 keepsyms=1 -wegbeta -no_compat_check slide=0 -vsmcbeta dart=0 darkwake=0</string>
What does the "-no_compat_check" argument do? Before I killed my LGA1156 Hack I was using this Boot argument to use the MacPro5,1 SMBIOS in Catalina and now that I think of it, I think that I was also bypassing the Clover boot menu then, or at least it was booting much faster.
Thanks again,
Bruno