You could possibly use the Change Metadata node to re-order fields by feeding it with the appropriate data to set the required field order. However, I understand the field order is not guaranteed to be honored in all situations.
In addition - as a bit of a 'kludge' - you could try using the Select Fields node in the Community Custom Nodes section to re-order the input fields. It was not designed for this purpose but the effect of specifying the output fields does set the order of the fields on the output. You would still need to insert the commas, but you would at least not need to type in the actual field names.