FWIW, we found that we can dilute Dr. Brommer's soap with water and it works really well in those same foaming soap dispensers (and it foams!). Pure organic saponified oils for washing my hands... for the win.
No more, I now dilute a little Bronner's in an old spray bottle with a lot of water, spray it on, wipe up my kitchen debris, stuff smells great, cleans up the counters a treat, and is insanely cheap for the value.
Are you just re-purposing standard off the shelf foaming soap dispensers or did you buy something in particular (e.g. can I reuse a Method foaming dispenser)?