My son wanted a super lightweight, low latency, wireless (BT & 2.4Ghz) mouse and was recommended the VXE Dragonfly R1 Pro Max (with the 4K, 2.4Ghz dongle). I ordered from AliX for about £43 all in and it took just under three weeks to arrive.
Exceptionally light (48g - we weighed it!), minimal styling, really slippery PTFE skates, on board DPI switch and lovely switches. The dongle enables 4k polling...
However, it's ambidextrous, not particularly large and you do need to use the Chinese app* to set the polling speed and adjust the DPI settings (we set it to 400, 800, 1200, 3200 & had to try 26k for gits & shiggles), and assign a LED colour for each setting.
The settings are stored on the mouse, so this only really needs doing the once, then the app can be uninstalled.
I believe the R1 Pro Max can be picked up in the UK for about £47, although I don't think the 4K dongle is included.
There's also an Attack Shark version with almost identical internals, which is Right Handed - so maybe worth a look...
(*I used my Pixel 9 Pro to translate the app, so I could change the language to Engrish)