This is surely not an elegant solution but it seems to do the job:
You can try an BulkAttributeRenamer since I found you can use User Parameters when choosing what suffix/prefix you want to add to the AttributeRename. You can just choose to Rename Selected Attributes and select the attribute for FirstMoment/SecondMoment and then choose the corresponding user parameter in the “string” parameter. Maybe these screenshots help:
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