I assume that there will be a big decline in Uppers ELO decks now that Zatman is gone, it will make it very hard to make a decent half-deck with Uppers without a high-powered 3 star. I also predict that there will be some new uppers in the near future that will make them more equal with the other clans. I think a good replacement would be a 7/4 card with no ability.
Dorian @ 3* would be a Power Substitute for him. (and then use Beetenka/jeeves in place of the 5* Dorian!)
Frankie Hi would be a Functional Subsitute for him.
Stanford could be a Situational Substitute for him. (unless Gheist, Roots and SOAs are abundant)