If it doesn’t work for whatever reason, then I’ll just doit your way without formatting /home. I’ve got it on a separate partition and have done clean installs where I just don’t format /home, rename my directory before the fresh install, then copy over what I care about countless times.
This is exact same advice I wanted to give You. As a webdeveloper before format I also copy my /etc somewhere (because I have pretty nice settings there), and then after installation I selectively copy-back what I need :)
Anyway, didn’t reainstall Antergos for a year now, I think. Last installation I’ve started with Gnome 3.14, then switch to Plasma for a while (I’ve removed gnome files in /home). It was ok, but touching settings panel was like minefield and I didn’t know if I will be able to login next time each time I change something :p Then switch back to LxQT (I’ve removed plasma files in /home), next Gnome 3.16 for a while and again to LxQT. (again removing gnome files in /home).
At this moment I’m running LxQT with kwin and as a backup I pick Openbox. I have no unwanted files in /home (I’ve manually removed them each time).
Before this installation I reinstall system quiet often, but at some point I realize, than I can learn something new by maintaining system. And I think really got some additional knowledge now ^_^
If cleaning /home is not enough for You, I believe You have to figure it out where Gnome (and all it’s applications) stores their files. I think that if you will use proper pacman/yaourt options you can automate this process pretty well.
I’ve found it to be a best practice to use separate user accounts for each DE when installing multiple DE’s on one system.
Why so? Just curious. Are there any drawbacks or gotchas?