You'll need to download the kernel, kernel-core, and kernel-modules packages for your architecture — those three have to be installed as a unit. But other than that, it's fine to leave the other ones for later, you can just sudo dnf install (the three packages I mentioned) and the new kernel will be usable even if things like kernel-headers are backrev. And I see that kmod(rtl8723be.ko) is in kernel-modules, so you don't have to worry about installing kernel-modules-extra.