This approach would be flown in LOC/FPA. You would descend down to 2000' for the FAF and then at the FAF it would be FPA -3.0 (plus temp correction) down to your MDA. The only DME you would need is where you can descend down to 2000' but that doesn't seem to be the problem here.
Or am I missing what you are saying?
I've never been in favour if this technique. Geometrically, it is impossible to fly down the final 3.08° path if you cross the FAF in level flight, because of the time it takes "wind in" the 3.08° because you're in level flight to start. You'll probably end up at least 100ft high, and that's if you get the aeroplane established on the 3.08° pronto, travelling at 250ft per second (150GS). Of course, now that you are high (and you have less than 1300ft to go to the MDA), you have to increase the descent rate/FPA otherwise you'll pop out way above the PAPI and have to go around. Not to mention the aeroplane dragging itself along at 2000ft, Vapp to the FAF, and potentially mucking about with the ALT SEL as well.
IMO, far better to set up the 3.08° further back and clip the FAF/2000ft on a steady descent path with minor FPA adjustments to go down the charted Altitude/Distance profile.