We use the WPI UMP3 in our lab, which I’m assuming is just an older version of the UMP4, with a Hamilton syringe. Instead of using the glass pipette + Hamilton syringe combo, we simply use a small-volume (2.5ul) Hamilton syringe with a removable 28 or 33 gauge needle (also from Hamilton). I’m not sure the removable needle would work in the spinal cord, since 33 ga might still be too large, and you may want the precise tip shape that you would be able to achieve by pulling your own glass pipettes. But for brain injections we routinely use the removable needle with injection volumes of 100-1000nl.
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