All in one solution for Site migration on Single and Multi Site usage

I was wondering if this was single solution to allow this to work. I've tried WPMU Snapshot but it doesn't quite do what I want it.

Basically, I'd like to Clone an external site that I've developed (single site), and then bring the clone into a multisite network for further testing. I want it on this specific multisite. Can this be achieved?

What I'm hoping to do is just a few clicks of cloning, creating a subsite, then importing the cloned site, and with it brings all of it's plugins/theme and contents. Would there be any issues in doing this? Like configuration or admin settings?