A variable speed motor is a viable option for an upgrade to your air handler unit. If you're still having any humidity removal problems, it's definitely worth looking at to increase comfort levels. It's possible to DIY a motor speed control on the existing motor, but the reliability of what is installed really depends on the existing motor.
A few other members have modded their units in this manner. Just read around on the forum and you'll find lots of stories and conclusions drawn from the process. Spoiler: everyone was satisfied with the new modes of operation.
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