I don't think so; just start out in Geneforge without using the canister, then get to Exile 3 and you can go back by retracing your steps (I'm assuming you know the way to convince Anaximander to open the side exit to Fort Emergence; it's unpleasant and degrading, I know, but as far as I know it's the only way back).
That's a lot of work, of course; does anyone know if there's a trick to get from Geneforge straight to Exile 3 without going through Geneforge 2 and the Exile series? I tried to use the broken ship, but even after I repaired it, it sank and I was eaten by piranhas.