Best use for the spare once I run out of surplus toner?

My 2nd C3326 no longer retains the color registration :-(. I tried to adjust it, but it didn't help this time; I hit my 3rd adjustment and ran out. That said, given that I need to get rid of 11(!!!) toners (some of which are the "C331H" version, which ONLY WORKS in the 3326 series). Given these things are now $115 and I'd take a bigger bath by not running the leftover toner, I had to find YET ANOTHER unit which uses this toner to deal with this pile of toner. I picked up a unit that needed toner (SWP toner; replace stop signal) and had to do some light registration work out of the box in the SM to sort it out to clean up the color performance. It accepted the adjustments, and its color has remained accurate for now.

At this point, the C3326 is nearing the end of its life due to the uncorrectable faulty registration. Given that this series is prone to error, I don't plan on trying again and burning the rest of the toner between the two units I have left, which aren't goners (MC3326/C3326). Beyond that, I have NO IDEA how to get rid of the MC3326 in a sane way as it will be out of toner unless the CMY registration also gives out on this one.

As the MC3326 seems to hold the registration, a parts pull condemn seems like a total waste :-(. What would be the best way to end of life it when it works, but I also got it to blow through $444+ worth of untransferrable "C331H" toner and the toner is expensive for such bad yields (1.5/2.5K)?