I would imagine the switch out would be simple enough. Replacement parts for the analog are available. May have to do some drilling and patching/pluging the digital controller mounting holes. As an alternative, if you are adventurous and not opposed to replacing all the wiring, here are two industrial links that may be of help that cover elements and controls. Pf course, your warranty will be void but you might be able to get a higher temperature. Enjoy!
https://www.wattco.com/calrod-heater/
https://www.tempco.com/Tempco/Resources/13-Temp-Control-Resources/ThrmstatThrmlCutoffsFusesCatalogPagesT.pdf