I couldn't find the one I wanted in the list (#1-#9)
At which list are you referring to, Mark (famous driver of the M-RKOZ 707)?
That flight plan converter tool gives you a list, but these items are just nice to have, not mandatory. I think that it only offers the enroute ones (you overfly them), no stations with an offset to your route.
You can use and enter
every DME you can tune. It only takes the coordinates there, so maybe that's the point where you are currently struggling.
It would need some charts or flight planning tools to see them. I'm using payware but maybe some freeware or even the map in FSX (haven't tried it) shows you those coordinates.
See an example here of a neat payware tool from Aivlasoft.
http://img849.imageshack.us/img849/9913/phnl.th.jpgSo you would enter the DME update mode, enter the coordinates of the corresponding DME (after tuning it) and use its position and readings to update. 4 (DME) stations around PHNL there.
My last flight in the 727 (twin Civa INS setup), where I used one offset and one enroute DME, even gave me a "0" on the accuracy, leaving me surprised since this is the highest rank possible there. As said, one overfly and one offset DME was used and I've changed the stations when getting more than 100nm away, so no extremely high workload there when in cruise.
But the trip was only 600nm long, so maybe that has to be considered too.