Hi Bryan,
I understand that you want to work around the “@” directory problem.
You can use “addpath” to add the custom toolbox path to the MATLAB search path and use “savepath” to save the search path for future sessions. This way you can access the custom toolbox functions. MATLAB software uses the search path to efficiently locate files used with MathWorks products and can access all files/folders in it.
The commands are as follows:
>> addpath(‘<custom toolbox path>’)
>> savepath
Refer to following links for more information on “addpath” and “savepath” respectively.
Hope this helps.