constrain scripted particles to an animated volume

[tycera]

I have a system using  PositionObject to place particles inside a torus volume. The scale of the torus is animated and I'd like to constrain the particles inside the torus. The trouble is, I have a script that is moving the particles, so anything I do to constrain them stops the script from working.

Is there a way to constrain in a volume while also having the particle positions being controlled by a script?