Thanks for providing the details for your current setup.
Yes, it is possible to integrate your setup/proxy with our cloud service using RADIUS protocol. We will provide you with the configuration details of miniOrange RADIUS server which you can configure in your Apache server.
Do you also want to user Multi-factor authentication(MFA)? Are you looking for any specific MFA method?
Also, you can go ahead with either existing components or can use miniOrange components in Apache Server. The advantage with miniOrange components is, setup will be easier.