Changing Task to UserTask (by code)

Got it:

var modeler = new Modeler(); // or BpmnJS if you use the pre-packaged distribution
var element = modeler.get('elementRegistry').get(id);
var newElementData =  {
    type: 'bpmn:UserTask'
};

var replace = modeler.get('replace');
var newElement = replace.replaceElement(element, newElementData);
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