I mentioned above the little utility I wrote to help make .tcx files more usable on the Lezyne by slimming them down, splitting them into different files, etc.

I've just posted the latest update, which has some bug fixes & improvements:

github.com/bhugh/tcxprune/releases/tag/v1.1.5

It runs on Windows, Linux/Unix, MacOS, Android, etc, as well as online here: repl.it/@bhugh/TCXPrune

In addition, I upgraded the documentation quite a lot. There are no pages explaining various options AND in detail how to install/run on your Android device and other Linux/Unix/MacOS type systems:

github.com/bhugh/tcxprune/wiki

(Apologies for the semi-links--I still haven't posted enough here to be able to post a real URL. You'll just have to copy/paste them into the address bar of your browser if you want to try it.)