This sounds like fun, I like that if you're super best friends with benefits the stardust cost for trading will be lower than two spoofers just trading regionals, the strength of friendship will also effect the pokemon. I'm not sure if it will affect the IVs or CP during the trade. You might not be able to say I got a 100 IV [insert pokemon here] I'll trade you [insert] for it cuz the IVs might not be the same once traded.
I guess that would be fair considering a lot of people used maps to get those perfect pokemon in addition to spoofing