I'm sorry that it's a bit pricey for you
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Unfortunately I haven't played the deck enough to know about the other possible combinations of Pokemon. I've only played it with Terrakion, and I have read about it being played with Terrakion-EX, Mewtwo-EX, Bouffalant and Zebstrika. That's not to say that your idea won't work; rather that I don't have enough experience to say whether or not it would work
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Feel free to let me know how it turns out. It would probably be a bit cheaper to make which is a bonus!
You've probably done this yourself, but it's nice to test out a deck using proxies before investing in it. That way you'll know if you want to play it or not and how well it performs against other decks.