Hello,
I hope you are doing good.
I've read the requirements of your project and I can do this customization in your bigcommerce store without any app or plugin. I have very good knowledge of Bigcommerce.
About my experience,I am a web developer by profession and I am working with Bigcommerce for more than 4-5 years. I can surely help you with this.
You can check my profile to see previous work: [login to view URL]~01918cb42823d24f32/
Rest of the things we can discuss in the message.
Ishant Gupta
Thanks