One issue with Enterprise Software that I've experienced is that all subcontractors are scrutinised and have to be listed in contracts, clients has to be notified/approve changes etc.

I would love to pay you money but run this somehow under AWS (Marketplace?) so that I don't have to request signatures from all our clients.

The issue, AFAICT, is all about who has access to personal data and where that data is hosted (jurisdiction wise).