I finally took the Qi charger off of my N900.
Qi is neat and I liked the idea of protecting my USB port, but the constant friction of daily use caused a break in the exposed ribbon cable where it made a bend, it was just easier to go back to plugging in than finding a compatible charger and making the adaptations for a N900 again.
I suppose that being in the twilight of the N900 experience I will look for a replacement which has integrated Qi charging, and since I just found an unused N900 there are perhaps a few years for me to change my mind and switch back to using the Qi mod.
If I re apply a Qi pad to my phone I will stick it down with the same 3M double sided sticky tape used to secure the LCD display into the bezel for tablets.