Multistore and Friendly URL

[HPoirot]

Hello,

We have a multistore feature enabled. And we have the addresses of the type https://mysite.com/e-shop/<shopname>/cms/7/opportunity

Actually, all the sales are done through the main shop while <shopname> is used to calculate commission.

What follows <shopname> corresponds to a certain CMS page.

We would like to eliminate multistores, but to keep the same addresses as before and (as before) use <shopname> to calculate commission.

If I just switch off multistore feature, I get 404 error while using old addresses.

Do you have any ideas how to organize it?

Thank you very much in advance.