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I think this is a great way to help chess become more complex. When I buy a set I'll make sure to get hawks and elephants!
Good on you! You should also join the Seirawan Chess Fans forum on chess.com
How about a new piece called the Bureaucrat? It takes 6 months to a year to make a move.
I'm starting a free quarterly email periodical devoted to Seirawan chess. If you'd like to subscribe, contribute an article on S-chess, or contribute a game of S-chess you've played, then you can find out more at http://hawkelephant.blogspot.com.au/