An intriguing thought, and something the Reds may have been noticing too; everyone was stacking agents in Chicago, and still is (see: Namshiel/Marcone, Butters, the Fomor starborn, the Titan, Svartalfs - but by now they may be drawn there by Harry as well as all the reasons why Lea may have nudged him there).
i'd point out no one stacked Butters in Chicago, he was there already when he signed on. And the Svartalves..likely have a presence in most major cities if they are that powerful. We don't know enough of those guys. They sound more Swiss or the like. Consulates in most major world cities? Likely have them almost certainly in NYC and DC, probably LA, London, etc.
I agree with Mira, if the Almighty wanted the Knights to have easy access to the Ways, He'd have done it by now. He doesn't always do such big things, just makes Forthill run out of gas in front of Michael's when he needs a babysitter. Heck, when Michael caught a Way in to save Molly... he still had to go back to Idaho or whatever with Harry to drive his truck back.....
(Ok, there was a little fringe - Michael's truck is fairly new, yet it works fine with Harry for a thousand miles? Some Heavenly mechanic adds Tempest level shielding? Just like Michael's house doesn't have issues...)