This has been discussed in the past, but here's a new FR:

>>>
https://i.imgur.com/lpfSHUc.png
The displayed icons would be those for the (filtered) listed plug-ins.
The images would be generated by Reaper only when a plug-in is scanned (deeply), stored in AppData somewhere and could be subsequently edited by the user.
Oh, and you could drag the pic onto a TCP or track