Upgrading plotter to C97 from RL70C, for use with ST60 instruments

Hello,
I am upgrading from aa RL70C pathfinder radar/plotter to a C97. I will be installing the seatalk to seatalkng interface for compatibility with my ST60 instruments.
Is it possible to replace the ST60 transducers with a tri-transducer that doesn’t have the paddle wheel for speed/log or would I need to replace the ST60 completely?
Thanks for any help.