Woah.
Go get something similar done with Adley. The length won't be similar given that Rodriguez is so much younger and plays a less decline-prone position. But a big guarantee with incentives to drive it up further is a good idea. Does make it difficult to project and compare though.
Yeah if Franco got 16.5 per, and Rodriguez gets 15 per then give him 8/128 with options and incentives or whatever and call it a day. Adjust as needed if he gets the full year service time before the deal is done. I don't care if the last few years are catcher decline years.