I really don't think an oscar is going to be an issue. Pikes are sneaky, stealthy, and intelligent. I have a 6" dwarf C. regani in my 150 gallon community with much larger fish but they never go after him. Similarly, I have a 6 - 7" male C. saxatilis in with some later cichlids and they don't even notice him. Why do these pikes get left alone when everything else in these tanks is constantly chasing/fighting? My only guess is that the pikes have quickly put the other fish in their places. lol
If I were you, I'd try a male saxatilis type. Sveni are pretty common. Mine is, I think, an actual C. saxatilis. Either way, they have beautiful spangling, are fairly easy to pellet train, don't get as big as the lugubris types, and seem to do well with tankmates. Mine is very personable and outgoing, and I never see my large cichlids mess with him. I'll try to get some pics.