Convert DAX variable string to impersonate measure

Hi. I am try to implement a 'universal measure' that masquerades as other ones I've already created, and also use it in a different calculation depending on a selected value of another dimension attribute. So my attribute 'Universal Metic'[Cube Measure Name] lists the avaiable measures to use, and then 'Universal Metric'[UM Calc Method] is a list of values describing how we want to use the measure (eg. default, previous month, varince vs last month etc).

Now I know I could use a switch statement to evaluate the selected [Cbe Measure Name] but when I have 100+ actaul measures this becomes unmanagable. Therefore my question is, is there a way to treat my VAR UniMeasure as the actual measure instead of it just being the string value? I was hoping there was a function I could wrap around the highlighted statement in the calculation below which would effectively be CONVERT_STRING_TO_MEASURE().

Hopefully someone has tried this before and succeded, or has a work around?

Thanks.