Hello!
Welcome to Linux Lite. We're glad you're happy with it so far.
Of course you can add certain LL features, such as Lite Cleaner, through the LL PPA. I use stuff like Lite Cleaner, and Thunar on Lubuntu installs instead of PCManFM.
Personally, I have never tried any of this on a Debian system, but there's always a first for everything. As a general rule of thumb, however, it's not recommended to mix Debian and Ubuntu repositories and packages...
73 DE N4RPS
Rob