We have developed a NetSuite SuiteScript version-independent framework, and we can use it to migrate any scripts or applications, while cutting development costs down to zero!
After the migration, you can continue working on your scripts exactly from the point where you left them just before, now using SS 2.x API :)
The core of this process is our re-implementation of the SS1 API, using SS2 API. Additional information on the migration challenges can be found in more blog posts:
Curious to know how we would handle your case? We have to analyze what you want to migrate, please contact us at SS1toSS2@ketka.eu