Based on one of Byron's other thread question about the number of pages one can have in Site Designer, I guess now we know why, and for what.
Unfortunately at this moment due to a family tragedy, I am off back to Bali for a few days (possible second lockdown permitting), so cannot provide my other solution for a couple of days. Which by then he may have already managed to get something workable.
Learning by doing. Responsive Site Designer Tutorials
https://mawarputih.coffeecup.com/forms/contact-wayan/