Group Policy is your friend.
Just navigate to User Configuration > Administrative Templates > Windows Components > Windows Copilot and double-click on the Turn off Windows Copilot policy. Select "Enabled" to turn it off, then apply and OK.
I always get downvoted for saying it, but I don't care because the real water savings never came from stupid showers: It comes from not growing crops in the damned desert; it comes from not growing grass on lawns in arid environments; it comes from not raising so many cattle.
Most low flow shower heads have a plastic insert in them called a restrictor that can be removed to make it work like the high flow ones.
It's nothing more than a small cylinder that can be pushed or pulled out from the shower line and manufacturers use these restrictors because it allows them to sell the same unit in multiple markets.
The ink costs for the E1 are already outrageously priced at $299 for a 600ml pack.
Not sure if tariffs on Chinese goods apply, but it can only go up from there.
Hard pass.