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You get the starting indices for user-written models in the same way as for library models! There is no difference between library models and user-written models in this subject.

Just use the appropriate API to get the starting index, e,g, mdlind or swsmind. A summary of available API's are shown in https://psspy.org/psse-help-forum/question/656/accessing-model-index-values-eg-var-nums-from-python/

Often things are much easier than people assume!