Tailor bios that u like, flash it to cards and u should not have problems running them moded on Linux.
LINUX KERNEL 5.5 OR NEWER--
Linux itself may not be ready. Ubuntu 20.04 will be released in a few days with (I believe) kernel 5.4. There are a few less popular Linux distros featuring kernel 5.5 or newer. From what I read, kernel 5.5 or newer has the real support for Navi cards, especially the RX 5600.
Current AMD Linux drivers are tailored for Ubuntu 18.04, and the kernel has poor support for the RX 5600. The RX 5600 with its "upgrade BIOS" is in a developer's limbo. It may also be the best bargain card with a good 40MH/s ETH hash rate when tuned. The Red BIOS editor can't yet mod the card, though.
Eliovp had a screenshot from his personal BIOS editor a few posts back (LINK:
https://bitcointalk.org/index.php?topic=5123724.msg53948630#msg53948630). I am hoping it will be ready for release sometime soon.
--scryptr
Part of copying over 1500 up timings is pretty easy to do, fine tuning them takes a little more efford, but running them on any Mining os system at this point is possible, so u don't have to worry.
I FINE TUNED MY RX 560 CARDS--
After reading Branko's threads on the bargain RX 560 cards, I tuned a set of RX 560s to about 14.6 MH/s ETH apiece. They have been stable for at least a year.
However, the RX 5600 cards were given a new BIOS by AMD that is not supported well in Linux yet. The BIOS is not currently capable of being modified, either. Non-modified cards can mine ETH at about 40MH/s, and these cards cost about 1/2 as much as an RX 5700. For top performance, currently Windows is required. AMD Linux drivers version 19.50 do not support RX 5600, and they are designed for older Linux distros like Ubuntu 18.04 and peers.
If you are satisfied with "any mining OS", fine. I'd rather build my own system than bleed "fees" to a third party. --scryptr