Well, if your goal is for him to show up in the PC dreams, ‘Dream Message’ can both serve that, and act as long distance taunting/intimidation. ‘Nightmare’ can serve a similar purpose, and can serve to soften up a PC on days he is sending minions to attack them.
As for clones, I do not believe there is an option yet. However you could possibly have lifelike animated statues of him (through the ‘Animate Object’ ritual) If I remember correctly, there were a couple of times Dr. Doom turned out to be just a robot, with the real Dr.Doom miles away. At level 10, he could be able to cast ‘Shadow Walk’ allowing him to be a moving target for the PCs, quick transportation for his schemes/plans, and could allow him to transport a small contingent of minons near to the party. ‘
Suggestion’ may also be a good spell for him, as inheritance would most likely have some social aspects and the ability to magically influence those aspects would be to his advantage. Plus he can use that to magically influence important people against the party. ‘Outcasts Curse’ could also be an interesting tool for him, both to use against the brother whom could inherit everything (ie, no one is going to want to give it to him if no one likes him, though at this point the PC ‘s most likely have a way to deal with it), and against people close to the PC’s, harming there family and friends, isolating the PC’s from others under fear they will be harmed, while preventing said family/friends from helping them because they got there own problems.
Oh, and perhaps a cat familiar, for classic the ‘pet cat while scheming/doing evil things’ villainy.
