We would like to invoke a layout pcell callback from SKILL code.
After reading through the forum post on design migration and abInvokeCdfCallbacks (https://community.cadence.com/cadence_technology_forums/f/38/p/32397/1340918#1340918) and the help case 'How to call CDF callbacks procedurally from SKILL?' (https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000namyEAA&pageName=ArticleContent&sq=0050V000006PHLGQA4_201772013217119
As the author of this code, I can answer this ;-)
You can find out more about the full headache of CDF callbacks in my article The Dangers of CDF Callbacks