[Suggestion]: Hose Pulley Fill Level

[Joblerone]

problem: Attempting to create a river that rises and falls as my factory demands. I want to create a method of reading the fluid level of a body of water connected to a hose pulley, but all the fluid gauges seem only to read the hose pulley's internal buffer.

current solution:
Workaround has been two hoses, one for input, one for output, and reading the fill of a tank at the output. Could maybe use smart observers to physically look at the water level, but that has downsides based on where the smart observers are, and they can't communicate to a proxy block to tell the logistics system about it.

proposed solution:
an extract-only hose pulley that lets me extract water pumplessly into a bottler (in the same way a bottler can extract pumplessly from a tank) and whose logistic contents is equal to the available in-world fluid the pump can reach, which can discriminate based on hose length. yes, i'm aware that's a lot of functionality.

alternatively, a block i can use to proxy fluid fill levels to the logistic system, such that i could signal to that block via the smart observers i discussed prior, preferentially one block that can fake both fluid and item signals