First, you should edit your post to remove the part where you ask if someone knows where you can get 4-AD. No one can reply to you regarding that because 'source' posting of any type is not allowed here.
Secondly, except for 'test' itself, I'm not sure much of anything would replace 4-AD as a helpful adjunct to M1-T. Certainly, there are a few other options, but none that would be as good of a combo.
Are you mostly concerned with the lethargy side-effect? I mean, is that the primary cause for your question?