Given the application is not distributing the DC then that certainly alleviates a variety of safety concerns.
And yes if you have no in-house electrical engineering capable of setting up a simplified supply, then a commercial supply that complies with all applicable standards (whether it be for mains connect aspects, or safety to operators, or something related to connectors if you are not using fixed wire to the load equipment) is appropriate.
I'd suspect that safety related aspects of the total system would need to be competently assessed and documented, as a way to cover identifiable risks, and that mitigating those risks comes back directly to the specs of the power supply just as much as the connection and use of the power within your widget. Just one example is whether there is active monitoring of the DC rails with respect to an earth fault - the power supply may include that - if not then commercial devices like from Bender can be used for interlocking.