Yes. It appears that the signing is self contained within the individual kext in the plugins directory.
But does the signing of the parent, IOATAFamily.kext, not get broken?
I still don't approve mixing and matching kext's when you don't have to. In this case they are the same versions, but you are using one Kext in this group from Mojave, two from Catalina and that's not necessary. The entire IOATAFamily.kext in Catalina Beta 2 has everything; it signs properly, even the parent IOATAFamily.kext. So what I did is used the IOATAFamily from B2 and used it on B3.
Now the Mac OS HFS Standard discs is another story. I had to use the ones from Mojave to get that Standard HFS to work on Catalina (pre HFS+).
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I am not sure the patch worked successfully. Couple of members tried it in the Mojave thread but the outcomes seemed unclear. There certainly seemed to be problems getting RX569/580 cards working reliably so the 7950 is not guaranteed to work. I feel at present it is best to stick to a nVidia Kepler card, ideally one with the efi rom to make life easier with an unsupported mp3.1.
I will agree that a Kepler card is easier.
There is one card that I used and I highly recommend it. It is the Galaxy Nvidia GTX 680 2GB. It runs faster than the classic EVGA GTX 680. The Galaxy is flashable. It's graphics also read correctly on the card when inside Mac. It has a Direct Cooling Unit and has a nice black and Chrome look to it that matches the Mac Pro's interior. It has a cool glowing blue LED light that says Kepler Galaxy GTX 680 on it. Two large but very quiet fans, 2x card height, and it comes Factory overclocked; if you flash it, it keeps the over clock settings.
I've been through many different brands of 680 cards. I bought and sold $5000 worth last winter.
Between the EVGA GTX 680, its graphics test runs about twice the speed. I sold my EVGA after getting this card.
I also have a Kepler Titan 6GB card, the Galaxy does not run quite as fast as the Titan, but between the EVGA and Titan, the Galaxy sits right in the Middle. A nice sweet spot for the money. I was lucky to get my Galaxy card new in box.
Of course, any Kepler card will work. If you are on a budget, boot screen and speed doesn't not matter, you can go as low as a half size GTX 650 card. You can get those for around 25 dollars.
680 card prices have come down. Anywhere from 50 - 150. On the high side 150 - 250.
Some users have had problems with not all ports working on the 4GB Card's that are flashed. It uses a hacked ROM from Germany and you can usually only use 3 ports at time on the 4GB cards. YMMV
2GB cards flashed for Mac do not seem to have this issue or at least I am not aware of it.
You use any unflashed Kepler Card except for the Titan Black.