Hello,
My name is Sergey. I am Freelancer from Saint Petersburg, Russia.
I can help you as an experienced Woocommerce programmer to implement these restrictions and form my work as standard WordPress plugin
In short words 'specific product' can be added to Empty Shopping cart only.
And all rest products can be added to Shopping cart if 'specific product' is not in Cart.
Mix between 'specific product' and any other products is not possible.
Please, show me your site and name "specific product".
Can be done today, now.
I need FTP or SSH access to start right now. And login/password into "wp-admin" Dashboard.
I can communicate via Freelancer.com.
2000+ successfully completed projects, including 80+ Woocommerce projects, speak for me. Links and reviews from my past clients available in my profile.
I am an individual, I am not a company in any meaning.
As for example:
1.
"WooCommerce bugs"
https://www.freelancer.com/projects/Wordpress/WooCommerce-bugs.html
2.
"Fix Wordpress Theme - WooCommerce Style Conflict (see attached images)"
https://www.freelancer.com/projects/php/Fix-Wordpress-Theme-WooCommerce-Style.html
3.
"Resolve a plugin conflict"
https://www.freelancer.com/projects/Wordpress/Resolve-plugin-conflict.html
4.
"Fix plugin problem Woocommerce cart not updated when discounts applied"
https://www.freelancer.com/projects/php/Fix-plugin-problem-Woocommerce-cart.html
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Sergey aka Takereal