Polypropylene (film) capacitor

Dear Susan,
Thank you for your post.
There is never a fully satisfying solution when the right model doesn't exist. If this component is not critical for your application, it could be possible to use the ceramic type II mean CV model. Not because the technology is close to the film capacitor but because it is a mean model and because to my knowledge -and without any guarantee-  film capacitors have a mean reliability (compared to other capacitors) in older handbooks. Before applying this you should do your own research to provide evidence and justification for your choice.
May be other reliability engineers would give you other advices?
Regards,
Lambda