Hey @helendeedee, team ShopStorm here :) We've built the Product Customizer app, and we'd be happy to have a look into this with you! Personalization options will need to remain in your "add to cart" form, but we can definitely take a look for you to see if using a tab is something we can help get set up.
Could you please send us your shop information in our contact form here? Thanks! -Justin