Anyone have any thoughts on this?

You could use a Ui-Only Formula Field to differentiate between a field being zero or blank, e.g. a Checkbox Ui-Only field called “MyFieldIsZero” which returns true only if the value is explicitly zero

IF({{MyField__c}}==0,true,false)

Then in your page, where you were using {{#MyField__c}} you could instead do {{#MyFieldIsZero}}… {{/MyFieldIsZero}}

And how would do that for number fields? I can see you rely on Javascript, meaning that 0==‘’ is true. In this case how do I know whether a field has 0 value or is blank?