I had a Lucy, and didnt find that the grinder got hot. The boiler isnt in direct contact with the grinder and if you grind on demand anyway the beans wont get warm.
Probably the best mod I did was the stepless mod and putting a wrap of teflon tape around the top burr carrier to stop it wiggling about so much.
Nice machine. Got the most beautiful microfoam out of it. Kinda miss mine.