So I read the documentation for RH9 in regards to setting a kernel other than the latest as default and it only covered one time reboots. Useless in the OP’s desired setup. The thing is that with BLS grub2 is not truly controlling the boot. The OP’s desire is an edge case, but valid if you have hardware that doesn’t work with a particular kernel. Oh I should note that the OP is using RH8 but the documentation is probably just as sparse. So the only real help that will be useful is for someone who has actually mastered this on their own replying to this thread with their knowledge.