I understand your frustration. We've all accidentally sold something at least once (or close calls).
I recommend using a stylus. I love it. I finally got one a couple months ago because my hand would get tired faster than me when playing games on my phone. I never felt the need for it for Elvenar but since I had it, I began using it and now I nearly always do. Tapping things that I meant to tap are much easier (esp moving stuff... even if you grab the right item, it's difficult to see under your fingertip but the narrowness of the stylus is much easier----but when possible, if I can be patient, I still prefer to rearrangement on desktop where I can zoom in and use the cursor). The stylus has also been helpful for neighborly help (which I choose to do exclusively on mobile because the interface is so much faster than entering each and every city on desktop) because it is not as easy to initiate accidental scouting (with a sigh of relief when declining, or cursing afterwards if still hit the wrong button) or enter a tourney tent when aiming for the little NH icon after tapping on the city name. Also super helpful for collections, especially during FA when quantities matter (one-two-three-collect, one-two-three-collect, one-two-three-dammit, grrrrr).
Maybe we still need a trashcan (or call it something else, trash in limbo--still retrievable), or not, but until (if) we do, a stylus should help reduce the problems. ...in my opinion