Sideloading is super easy after installing Terminal Emulator and a web browser.
You can use the terminal app to perform all of the same ADB functions as you would from a PC,but you have to use the PC once more to install the Terminal app and a browser.
Somebody needs to pin that original topic that tells you how to do it,as it helped me greatly on sideloading any of the apps I wanted in mere seconds by downloading the apk through a sideloaded browser and installing it via ADB function on the sideloaded Terminal App.