You could make the php code call DRF endpoints as two different apps, but I'm not sure how useful that'll be with what I think you are trying to do.
If you are intending this to be a client to server (I.E. a web browser) presentation, then java script is about the best/only way to go (lack of options here). However, if you are intending to do something that is service to service, then you can use whatever
language you like.
Another option is to use Django's built in templating engine for client presentation and use DRF for an API backend for services to call.