How to embed forms in a page that is 1 big form?

How to embed forms in a page that is 1 big form?

Ok, some context ... we are a small football (soccer) club and we use Zoho CRM to manage our membership database. I want people to be able to sign up (as leads) and then we can add them to our mailing list and target them for match day tickets sales etc.

The website tool we use has an odd thing where every page is wrapped in a <form> tag ... I have no idea why and the providers don't seem too interested in removing it, but that does mean I can't embed a Zoho CRM form in a page ...

I think if I use an iframe I might be able to get around it, but other than that, can anyone think of another way? Maybe some Javascript to transform the outer form into the correct format so it mimics the Zoho one, but that might be a bit fragile if the design changes or whatever ...