How easy is it to convert an options page to use Optimize?

I've my own core responsive theme I developed myself and updated along the way for my customers.

I developed an options page (driven by Arrays and PHP calls) to collect standard settings, page width, colours, font sizes, etc.

Now I really should customise( :smiley: ) the theme to use Customise instead...but how?

Is there a magic tool to convert anyone knows about?