There already existed a step height EAM for Fabric. Perhaps it's possible to make them compatible by somehow making stepheightentityattribute:stepheight an alias for the one in porting lib?

https://github.com/emilyploszaj/step-height-entity-attribute

Registry aliases aren't a thing and seem unsafe. What would even be the benefit here?

I haven't properly tested yet, but there might be some inconsistencies in the order the attributes are applied. It wouldn't be an issue if mods only use addition, but multiplication might be a problem.

I know registry aliases aren't a thing, but I thought it would be worth investigating. I can look further into it this weekend.

Closing this as not planned