Are you talking Ethernet B3000s (SNAP-B3000-ENET) or the old serial ones? I ask because an OptoEMU can talk to just about anything Modbus, and most of our brains talk Modbus, so that might be an option for migration at some point.
In the meantime, you could convert your OptoDisplay project to PAC Display Pro and continue to have it work w/your LCM4 Controller while expanding it to include your OptoEMU too! Lots of fun options.
Form 1692 talks about migrating from FactoryFloor to PAC Project. The last chapter talks about OptoDisplay. I understand upgrading your OptoDisplay project is super easy (just a wizard) but you would want to back up your existing stuff and a few other things first. The doc goes through all the details, in a nice step-by-step for you.