Is there any alternatives for Field merge allowing for multiple filter criteria ?

We have Custom Object field merges with optional criteria set already in our Eloqua instance. But we want to add a new field into the CDO which is also to be added as a filter in the field merges. For example, the existing CDO has only 1 region data, but we want to globalize the CDO for multiple regions. In that case, the existing field merges should be adjusted to fetch data for already existing region (basically want to add Region filter in them). But since they already made use of optional criteria, we will not be able to do