Entity items to Models items

It would be a very small but very good change for resource pack creators.

With the arrival of the new snapshot 20w48a, the spyglass model was changed from a 2d item to a 3d one.

My proposal is small, the spyglass and the trident may have Modifiable models in resource packages without the use of optifine, currently there are already several resource packs that change the spyglass model in the new snapshot, but with the trident it is different since being an entity it is necessary to use optifine to change the model, it would be quite good that both models could be changed equally, finally it would be good to be able to make the spyglass in hand have its 3d model and the texture of the old item in the inventory as with the trident.