I'm uncertain as to what you refer to by "digital+analog oversampling" with respect to Trinity's reconstruction filter implementation. Are you saying that Trinity also utilize some digital reconstruction filter?
Yes, see http://www.whatsbestforum.com/showthread.php?12023-Trinity-DAC&p=243849&viewfull=1#post243849
Setting the above question aside for the moment, with oversampled interpolation the ultrasonic image bands will still be present, but shifted up in frequency by a factor equal to the oversampling ratio. So, while the typical analog filter can be designed to have a lessor subjective impact on the audio band frequencies, it should still be present in some form.
But if the digital oversampling ratio is high enough can you go without the analog filter?