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Short answer is "no". The custom pollers you're talking about allow you to replace standard data points (CPU, RAM, machine type, etc) with custom OIDs. You can't collect a custom OID and push that value into a custom property.
Also as a side note (for anyone else reading this as well) you don't need to create a UNDP poller in order to use the custom pollers found in Setting, All Settings.
However, you CAN use the UNDP data for reports, alerts, etc. So let's focus there. What do you want to DO with this information, once it's collected?