You could just call ff_filter_process_command() instead of hardcoding supported commands here. It will ignore any option without the AV_OPT_FLAG_RUNTIME_PARAM flag.
This is going to generate memleaks, and needlessly reallocate unrelated buffers. You should instead av_realloc all four s->bboxes buffers here, and reset s->limit.
I don't have knowledge in c/c++, I based my changes on vf_crop.c, but i will look into your suggestions.
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