The KS isn't worth the premium and will get outclassed by RPL i5 in a few months and also the 3080ti while being a decent card is expensive and will be beaten by a card half the price in a few months.
My advice would be to get a cheap 3060ti / 12600k and replace with a 13700k + 4070/80 in the future, you would end up with a stronger system for a similar amount of money that your planning to spend on the KS/3080ti.
This is the best path to take. 3060ti+12600 with all the other parts comes to under £1500 and then save thousands that you can spend on a new system in a few months or if you are happy with the performance skip the next gen entirely.
You just do not need a top end gpu for 1080p gaming.