Why do we need to clutter the Kemper and turn in into audio interface, multi-effect processor, floor board, millions of routing possibilities. That's what computers with audio interface are for.
Not to side track the discussion, but since the character and flavor of an effect is based on the algorithm that's used to create it, you may or may not be able to reproduce that with a plugin, that is unless someone's created a really good emulation of it, and even then that's no guarantee.