Hi I just want to say I'm another person interested in launchbox on linux. I sadly only switched OS's a year and a half ago and missed the time when you were asking about interest. I have lifetime licenses for both windows and android.
launchbox is the only thing keeping me back from running linux on everything. I know its a difficult task with less interest then other features, but I wanted to say I support it any form and hope it can happen sometime in the future however long it may take.
It's been a pleasure watching launchbox grow and only get better!