Prevent belts/inserters from connecting to modified belts with tag.

[TheAero1221]

Unsure if this is possible, but it would open up several modding possibilities:
I'd like to be able to selectively prevent inserters, loaders and belts from transferring their contents to specific 'other' inserters, loaders and belts.
"no-automated-item-removal" and "no-automated-item-insertion" only work for splitters and inserters, and only act as binary flags rather than filters.

Things this would enable:
Belt variants that only accept certain product types, and do not allow transfer, merging, sideloading or insertion of invalid products. This means you could have mods that have 'U-shaped conveyors' for rough/loose products and keep the standard belts for refined products. You could have 'channel' conveyors that actually transport molten 'liquids' around. You could simulate 'grated undergrounds' (aka: belts that appear underground beneath grates, but dont allow sideloading/merging with above ground belts). I actually think the possibilities here are endless, and only my imagination is falling short at the moment.

If this is impossible, an alternative that lets us place little walls that prevent the flow of items/transfer with inserters would be nice.