Good luck! Why are you thinking of switching over?
I danced ballet my entire life, then stopped dancing to do the whole corporate career life. I have recently started ballroom and use my ballet training every day. The hardest part of the switch is learning to follow (rather than working with choreography) and that is much more challenging than a pas de deux.
Can you do both? I am starting to incorporate some ballet classes back into my schedule for the intense strength training that you don't get from the typical beginner ballroom classes.
You have years of training - if you can, maintain your flexibility, strength, balance, and those foot calluses that keep you en pointe. My one regret is taking any time from dance - the concept of putting pointe shoes back on is not in my near future!
Have fun!!!