First redstone project, likely has been done before, my take on a simple item filter using copper bulbs and observers

I was building a minigame in my world and needed an item filter, but the standard Impulse item filter wouldn't fit so I needed a smaller design. Decided to fiddle around in a testing world, managed to find this design by detecting the signal change when items get pulled.

Unfortunately, it's not tileable in its current state because the redstone wire connects up and the bulbs get out of sync. Couldn't find a block that both keeps the signal strength information and is observable by the observer that fit the frame, and sadly observing the comparator directly doesn't work.

Any tips or improvements welcome :3

Edit: I've realized the filter has 2 less dummy items than it's supposed to. The correct ammount is 64 25. I don't think this will make it be tileable because of signal bleed but I'm curious to test it now, will report back with results later