the ipq9574 is already supported by upstream (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm64/boot/dts/qcom?h=v6.6.30) ; QCA also has 6.6 support already. So, I don't see a huge effort although must say on the region of 12months based on the experience with the ipq807x ... I also understand (tbc) that the the 2.5G and 10G on some of the TP-link devices are based on Realtek which may cause some problems.
At the moment really are the prices stopping any dev investment of their $ and time ... the BE550 is now being sold on amazon for about $300 ...