The company I work for switched to a different Odoo Partner a while ago. We're still using some of that partner's modules -- however, because they're not supported by our old partner anymore, I'm thinking of migrating them and refactoring them to our own needs.

They're working fine currently, but I'm concerned about their compatibility once we're upgrading to a newer version of Odoo in the future (we're on 11 currently). It'd be much easier if I was able to manage them myself under new module names (but not necessarily new model names), that way I could ensure they're updated correctly once we're upgrading our database.

Is there a way to do this safely without risking the loss of any existing data?