Alternative to 'Evalin' with Matlab App Designer

I'm creating an app that I eventually want to compile as a standalone application. The app constructs a GUI for a preexisting MATLAB program and I utilize the evalin function twice in the following manner.

First, I run a 'start' function as follows

evalin("base",'func.start')

This instantiates a number of variables which are necessary to run the GUI.
Next, I run the following code to read in one of the variables into the AppDesigner workspace.

fx = evalin("base",'fx')

I wanted to see if there was a deployable alternative to 'evalin' that could be compiled by the MATLAB Compiler. Any help would be greatly appreciated!