I think you are a bit behind the times, I would consider it insane if someone tried to convince me to use a WMO in this day and age. I think from my tests in the past (like 15 years ago), it has a poor refresh rate, low dpi and bad click delay, fucking negative accel, the only thing it has going for it is the shape and weight, which you can literally get from another mouse.

Sure you can overclock the mouse, but then you got to fiddle with software (unsure if can still be done on win11), you might like the low DPI, but it's not like every modern mouse can't run at a low dpi either, but you can't do anything about the click delay and negative accel.

I would probably try and find out what pro CS2 players are using now or something, generally there was a lot of cross over with the quake players in the past.

Im not even sure what dpi does to this day, but 400 dpi and 500hz seems enough, except perhaps on tiny increments when I use low sens with some accel on lg, that I assume modern mouses will feel better. The problem is i cannot find a shape that will be good, and side buttons suck. They place them where my thumb rests.

First, it is near impossible to find a modern performance mouse without side buttons. Though the Logitech G Pro wireless series allows you to remove the side buttons on either side and place a blank plate instead. That could do it for you.

Second, there is no direct replacement for the WMO in my experience. I recall you as someone not willing to try real change, but there are some options that I genuinely believe WMO users can migrate to:

Gamesense MVP
Roccat Burst Pro
DreamMachines DM1 FPS
Zowie ZA13 / ZA12
Logitech G Pro Wireless / G Pro X Superlight / G Pro 2
Endgame Gear XM1 series / XM2 series
Steelseries Rival 3

You could probably adjust to more than just these, but these are the ones that took me little to no time or changes in grip.

From the ones you mentioned, the Lamzu Maya X is a decent option too. The Endgame OP1 is too low and narrow in my opinion.

Been there, tried A LOT of mice!
Even I tried to change its internals, and tried wmo inside with another mice..

Tried everything, but the feeling is the thing with wmo, I always thought it was the shape but nope it is not trust me.

So you might find similar shapes, but even if it is 1mm off, you wont like it if you are like me. So I gave up and tried different kinds of mice, and weird enough only one I liked was mk2, it is a bit expensive (a bit?) its feeling is great to me, shape takes time to get used to, it is like the opposite of wmo, but works for me great.