It depends a lot on how much you enjoy DIY.
These are viable but you have to do a firmware rollback
Also possible by a few means but your best bet with High Frequency would be the SimpleAC from @Chimpofm or you can do low frequency with this Access Controller and projects similar to this one
I think the duality of the NExT having HF and LF makes it a good choice but that’s up to your preference.
maybe this