Hi Chaz, it depends what you mean by an 'audio interface'. If you're new to audio, it's best to be clear with your requirements.
If you want a device which provides one or more mic and line inputs and converts those signals to USB so that you can record on a computer using DAW software, then the answer is no. There are several audio interfaces which do this, with varying numbers of inputs, but you'll be relying on the computer to do the recording so will have to learn how to use a computer and a DAW, both of which bring their own quirks and problems.
The DP machines are designed to be completely free-standing so you can record, edit/process, mix and master all within the machine, although there's nothing to stop you splitting the various processes between it and a computer DAW so you can exploit the advantages of both ways of working. Tracks can be transferred to and from a computer. This cannot be done 'live', but they will be perfect digital transfers with no degradation.
I don't own a Model machine, but from what I understand, the Model series is a hybrid system with the emphasis on recording lots more channels simultaneously than the 8 for the DP machine, and on basic mixing of these tracks, so they can be free-standing up to a point. Any further processing has to be done on a DAW, but the machines offer live USB links for all tracks as well as the mix. The sticky posts at the start of the forum have more accurate info on these.
From your wording, it sounds like you are put off by the complexity of the DP machine. This is understandable for newcomers as they offer the sort of facilities you'd find in a real studio, so a lot of the learning is more to do with general multi-track recording terms and techniques, rather than how to operate the machine itself... although the machine does have some quirks so it tends to add to the confusion until you get your head round it
But I would revisit your requirements before making a hasty decision and changing to a different system. All systems require some degree of learning, and you may regret not having these features as your skill progresses. I have a step-by-step guide which will get you off the ground very quickly without having to delve so deeply under the hood, so it's a good complement to the videos... but I'm not the one to recommend this as I'm obviously biased on this matter
I'm sure others will have some advice to offer you, especially those owning different gear, so hang on till you get more replies. Meanwhile you could help by posting a list of the sorts of things you want to do, and whether or not you are ok (and/or competent) with using a computer and/or DAW.