How to hide a few objects of a multiple combined object cloth simulation? I got a simulation of falling money, made from planes instanced by a particle system, combined into one object and then simulated as cloth. 

Everything is basically working, but there are a couple of bills that I would like to hide from the render because of weird collision errors.

Problem is, I can't seem to figure out any kind of a way to access just these few objects to be able to hide them without having any other effect on the simulation.
What about adding some light force field (for example: wind) coming from the inside of the bag, just to avoid the collision of particles with the bag itself?

Here's a tutorial to manage the overlapping particles in Blender, not sure if it can help you.

You can also try to use the shader Particle Info Node, trying to identify the particle ID and setting a custom shader node (Transparent for example) for these particles.