Why is <220 ppi a dealbreaker? 27 inch 4k displays seem fine to me for retina and they are quite abundant. Though I've tried 32 inches 4k, and there the resolution is not enough for text work.
Dell has a 32 inch 8k display which is ~280 ppi in stock.
Dell has a 32 inch 8k display which is ~280 ppi in stock.
https://www.dell.com/en-us/work/shop/dell-ultrasharp-32-8k-m...