Replace Tork 1101 timer with smart switch
Go for it

You should be able to get a deep single gang "handy" box and fit it to the nipple in place of the existing timer enclosure, then fit whatever smart switch into that box that you wish, given that you're only trying to switch ~150W of load.  Note that the red wire is your always-hot and the blue your switched-hot, according to how the current timer is connected, with white being the neutral of course.