Hi Nathan,
From what I understand, you are using "Surrogate Optimization" for solving your objective function, but the problem requires you to make some custom changes in the code, which you are currently unable to do since the code for "surrogateopt" function is not exposed.
You can try referring to the following MATLAB example on modifying "surrogateopt" options for solving problems:
If you want to know more about the Surrogate Optimization Algorithm, the following MATALB documentation page might be of help:
If this still doesn't solve your problem and you require some pre-existing implementation of surrogate optimization, you can try referring to the following File Exchange submission:
Hope this helps!
Best,
Umang
