Faff... yeah, sorry. Overly complicated task that doesn't really need doing and doesn't actually achieve much in the end. Mucking about, basically.
I was thinking that if I ran the pump through the Octo I'd also be able to keep an eye on the pump RPM. That way I could monitor everything via Aquasuite.
I don't know if you'd need to do something special to the devices settings in Aquasuite, in order to differentiate it as a pump rather than a fan. I'm not (yet) an expert on Aquasuite, so maybe someone else will advise...
In theory, though, I think that would work just fine.