Do you have some use case? With UEFI console, it is possible, but you need a custom kernel with some special modification (no details at the moment, just a memory of doing this with help from somebody). Also, with non-zero probability of misunderstanding the question, could you provide some more details?
Do you like to keep image on internal display as is? I am afraid it is not possible - both internal and external displays show the same image until X or something similar is in use, so if you try T-Daemon's patch, either internal or external display shows image with proper orientation/rotation, but not both. Additionally, to change the selection of display orientation, you need to edit /boot/loader.conf where the tunable as mentioned resides, and... reboot.
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