Custom forms on product page instead of pop up?

Site URL: https://makenu.co.uk

Hello! 

I am working on product pages at the moment and as our products are customisation-heavy, I need the clients to be able to input all the details before hitting the "Add to cart" button. The forms are very useful but my issue is that they trigger a pop up after clicking "Add to cart" which I don't really find convenient and I would like to have these forms show on the product page themselves... For example on this product: https://www.makenu.co.uk/shop/p/revive-monogramming (I changed the "add to cart" text to "select my letters" for now to test a workaround solution but I basically want the form to appear below the quantity selection.) 
Hope my question makes sense! 

Thank you

Hi Paul, 

So there isn't even a way to code this into the site?