I think we have a 260 chracter length restriction problem

Yes, i'd consider making shorter names/descriptions. But also remember, you can set some of those details as properties and even auto group instances based on a property value.

Pick one thing that is sufficient to uniquely identify the instance and use that as the wild value. Set the wildalias to something easily displayable in the UI and in alert notifications. Set longer text in the description. 

So, you might do the following:

$drive##$name##$extension##customjob.nul=$nul