It seems to me that you have done plenty of calculations. One that you haven’t mentioned, though, is the cheap 7p rate overnight. If you can shift your white goods to run then, you will save even more.
Have already gone down that route. A 10 – 100% charge would only cost £5.30 on an Ioniq 5 which is a real bargain. It equates to under £11 compared to £60 for current petrol car.
Currently with eon and done some rough calculations switching from 22p / kwh to 7p & 30p and standing charge stays at 50p / day.
Bizarrely, when I initially looked on their app it said Ioniq 5 was compatible with their smartdrive tariff at 6.5p but now it says its not. Put MY25 & 84kw rwd both times.