MorphToSelect with one type

I'm building multiple forms that all write to the same

subject

subject

morph on the same model. But each form has it's own specific type that needs to be set as the

subject

subject

. What I'm looking for is a way to set the morph type by default and hide the select field for type, as it's already known.

Is this possible?

MorphToSelect with one type - Filament