Adding my opinion here, I apologize in advance for not answering your specific question.
It seems to me you are trying to build the perfect custom, based on what you think is missing from Primal Seduction. Don’t.
Since it’s Primal Seduction, I assume you are looking to hook up a lot. Don’t overthink this , it doesn’t matter what sub you are running, you will get rejections: hard and soft. You will get flakes. Accept the world as it actually is, instead of building that perfect sub that will change the world.
Run Primal Seduction alone for 3 months while actively gaming. Learn your weaknesses based on your actual experiences and only then consider building a custom to help with those weaknesses.
Good luck with your journey and again, apologies for not minding my own business and giving unsolicited advice.