Two-level multisites

Hi there.

I’m wondering if there is a way to implement something like sub-multisites, like parent-child multisite relation.

So, what i want is a way to have something like this:

/site1
/site1/subsite1
/site1/subsite2
/site2

etc…

My approach has been use mod-rewrite to change from /site1-subsite1 to /site1/subsite1 meaning that I’m aware of the permanlinks changes, etc…

I will like to know if there is a more cleaner way to achieve this.

Thanks in advance.