Akula, thanks for the comps. No where near your mounds of bodies but I can't sculpt at the best of times so this was a better option.
Clach I would advise against using the plastic cement. The amount you would need to melt the plastic figures will be difficult to control. You may end up with a chemical reaction that melts the figures completely or continues to melt them for days or weeks later.
For the cheap superglue here in the UK. I have found that any of the glues with the cone shaped caps are the right consistency. They look like this.
I usually find them in pound stores so it is a bonus as they are cheap.
It is a similar technique to what I used in my sand runnel tutorial.
http://snitchythedog.blogspot.com/2016/07/realistic-sand-runnels-or-erosion.html