Just a random thought and I haven't tested it but couldn't we just play Displacer in the main shell and alter the land base slightly to accommodate? So basically, dropping the Lotus Petals but playing 4x Crossroads, 4x Cavern, 2x Karakas? This would allow you to keep in the spirit guides and could even play thorns main (or not) which would end up being a personal choice/meta call, depending on what you wanted to sub the Displacers in for. According to the CF guide, 10 sources should still allow us to cast Displacer by turn 5 consistently and I rarely want to cast him early on to begin with. Is it too greedy with that kind of mana base?

I may sleeve something like that up and give it a try. I think it's possible if you go down to 1 CoT, which a lot of people seem to be leaning towards anyways.