Hi Nelson, welcome to the board. I can get you started by guessing at the ball park. According to the Alembic site, when ordering a new Epic, the upgrade to Essence controls is $200; and when ordering a new Essence, the upgrade to Signature controls is $850. Thus a ballpark guess might be $1,050. As to whether it's possible or if routing is required, I don't know. If my guess at the ballpark seems like something worth pursuing further, then perhaps the next step would be to give Val a call.
