Surplus passive radiators?

Is it plausible to install surplus PRs onto the side panels / top of closed box speakers with suitable internal volume, given that I think what size and type of PRs is suitable? Also considering switching a port to a PR. (?)
I just love passive radiators.
Can I, for example get a nominally 40Hz capable box to output 25Hz with proper modding with a PR?

Hypothetically, if I were to have too many PRs, wouldn’t the pressure’s energy divide across all of them, giving them very low thrust and thus rendering them useless? (Stupid question…)