Sorry if it looks like I'm talking down to you. I'm not. I'm just posting the game mechanics for all readers in the thread to understand espionage better.
GPPs:
Of course you run 3 spies, that's the whole point of Const. Just about any 'average' city can do this with very basic food.
9 base GPP x (Pacifism, PHI trait, Golden Age, parthenon) = 40 GPP
2 MoM GAges are
36 turns (Taj + 1 GP)
edit: only 30 turns
That's
1200 GPP!.
If you plan ahead, come of your GSpy cities can run 1 spy for ~50 turns before the GAge/pacifism. That's a
300 GPP headstart. So you see, even the lamest city could produce the more expensive GP #10 @ 1500 GPP
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If you get the GW, that city can do 49 GPP instead of 40 (1960 GPP)
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And then there's the NationalEpic city which cannot make 100% pure GSpies, but worth adding to the mix.
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research cost
I too shut off research after CS and steal/trade for all but Music, Nat, Const. The amount of EPs you can generate right after Oracle/CS is microscopic. It's like saying you're going to run 100% culture slider that early in a culture game instead of researching on and building cathedrals, etc.
Nat and Const only cost ~6000 gold on epic speed. So you only lose, let's say no more than ~9000 EPs -- the equivalent of 2 Gspies. As you pointed out, getting tons of GSpies with your solo specialist slot will be either impossible or a crapshoot, meaning you'd have to run spy+artists and get very lucky. Jails make up for the 2 lost GSpies with ease.
Again, I'm saying the
jury is still out on which approach is faster. However, I'm sure the specialist approach is way better than you think it is. The question is : can you beat that with CS/Buro/cottages? That's why this discussion originally started with my hope that you would compete. Instead, you will be eating your words when this is over (again

) and it will be too late to join the competition.