I have found a viable solution:
<a href="https://www.youtube.com/watch?v=etVGAF2p7zk">Signal strength memory</a>  

It does exactly what the description says, except the "button" has to be exactly 2 ticks or it will increase/decrease too much. A simple pulse shortener should sort that out.

Here is what it looks like as well as a layer breakdown:  

[![Final + Breakdown][1]][1]


  [1]: https://i.sstatic.net/nSsNG.jpg