How to Embed Another Template Within a Website

I’m trying to add a page to my website which will show a live version of a template I am building for someone. I thought of using a subdomain, but then I would have to install WordPress, etc. (wouldn’t I?) there and that will take up too many server resources. Is something like this even possible? I haven’t been able to think of a way.

I have already done it at template1.25julydesignstudio.com but that’s a subdomain. I’d like to actually put it on the site.

Thanks if anyone can help,

Dianne
[sig moderated as per the Forum Rules]