That's right. The cloned external disk has its own EFI with all the necessary clover/Rehabman hotpatch stuff.
in /EFI/CLOVER/drivers64UEFI:
-rwxrwxrwx 1 Me staff 12128 10 Okt 21:27 ApfsDriverLoader-64.efi
-rwxrwxrwx 1 Me staff 17280 10 Okt 21:27 AppleImageCodec-64.efi
-rwxrwxrwx 1 Me staff 1732 10 Okt 21:27 AppleImageLoader-64.efi
-rwxrwxrwx 1 Me staff 5376 10 Okt 21:27 AppleKeyAggregator-64.efi
-rwxrwxrwx 1 Me staff 5440 10 Okt 21:27 AppleKeyFeeder-64.efi
-rwxrwxrwx 1 Me staff 2400 10 Okt 21:27 AppleUITheme-64.efi
-rwxrwxrwx 1 Me staff 14656 10 Okt 21:27 AptioInputFix-64.efi
-rwxrwxrwx 1 Me staff 25440 10 Okt 21:27 AptioMemoryFix-64.efi
-rwxrwxrwx 1 Me staff 5696 10 Okt 21:27 DataHubDxe-64.efi
-rwxrwxrwx 1 Me staff 21952 10 Okt 21:27 FSInject-64.efi
-rwxrwxrwx 1 Me staff 7232 10 Okt 21:27 FirmwareVolume-64.efi
[email protected] 1 Me staff 24900 2 Feb 12:05 HFSPlus.efi
-rwxrwxrwx 1 Me staff 16512 3 Feb 20:05 HPFanReset.efi
-rwxrwxrwx 1 Me staff 13888 10 Okt 21:27 HashServiceFix-64.efi
-rwxrwxrwx 1 Me staff 4480 10 Okt 21:27 SMCHelper-64.efi
in /EFI/CLOVER/kexts/Other:
[email protected] 1 Me staff 512 3 Feb 20:05 AppleALC.kext
[email protected] 1 Me staff 512 3 Feb 19:52 AppleBacklightFixup.kext
[email protected] 1 Me staff 512 3 Feb 19:52 CodecCommander.kext
[email protected] 1 Me staff 512 3 Feb 20:05 FakePCIID.kext
[email protected] 1 Me staff 512 3 Feb 20:05 FakePCIID_Intel_HDMI_Audio.kext
[email protected] 1 Me staff 512 3 Feb 19:52 FakeSMC.kext
[email protected] 1 Me staff 512 3 Feb 19:52 IntelMausiEthernet.kext
[email protected] 1 Me staff 512 3 Feb 19:52 Lilu.kext
[email protected] 1 Me staff 512 3 Feb 20:05 ProBookAtheros.kext
[email protected] 1 Me staff 512 3 Feb 19:52 RealtekRTL8111.kext
[email protected] 1 Me staff 512 3 Feb 19:52 SATA-unsupported.kext
[email protected] 1 Me staff 512 3 Feb 20:05 USBInjectAll.kext
[email protected] 1 Me staff 512 3 Feb 19:52 VoodooPS2Controller.kext
[email protected] 1 Me staff 512 3 Feb 19:52 WhateverGreen.kext
[email protected] 1 Me staff 512 3 Feb 20:05 XHCI-unsupported.kext
I boot into this EFI/Clover and from there into the FV'ed volume. No issues so far (except that an external HD with encryption really taxes your patience...).