I have done half a dozen trips to Hawaii but none since covid. I live in London and my views are probably in a minority.
1) Travel both ways without a night stop, LA is my preference both ways,
2) Take the early AA flight from Honolulu to Los Angeles to connect same day to London,
3) Do not take a redeye to or from Hawaii,
4) Honolulu is not to everyone’s taste but I like it,
5) BA holiday double points still going next May so should be the way to go,
6) As others have said check carefully what cabin you are in to and from Hawaii,
7) AA recliner seats are fine for a day flight, no need for lie flat.