I want to clear up a possible misconception:
Running ARSLOAD on z/OS pointing to MP doesn't seem like something it can handle?
Absolutely it can no problem.
I have been around computing a few decades now and I have never been associated with a product that is as any-platform-to-any-platform as CMOD.
It's all handled via TCP/IP.
You can load z/OS -> Windows, Windows -> z/OS, IBM i -> z/OS, AIX and Linux are also in the mix.
You can load from any platform to any platform. It all works.
Ed