Bad idea the use of legacy, it is no more supported. Try this one, it may help:
https://www.tonymacx86.com/threads/solved-uefi-clover-boot-option-gone-after-bios-update.211715/
Man, you provided many details and I totally agree with you on this purpose.
Q. Why are you getting crazy to install OSX?
A. Just to improve my Knowledge.
Oh, and for those that are interested ;) only OSX is able to swap the system Hard Drive from one PC to another.
750 Ti needs to apply NVidia driver. I would suggest the iMac 12.1 System Definition. Actually I'm using a GT 9600, OS X recognizes it without extra driver.
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