The last post regarding the definition of CHELT gives a clear indication to one problem with your idea.
CHELT is defined using HON and SAM, two beacons which are not on the airway centerline which runs DUB - MID overall.
However, HON and SAM are used because of the DOC of those beacons relative to the position.
If you are say somewhere over Ireland and get a direct to CHELT, you are outside the DOC of both HON and SAM and thus can not use conventional navaids to check that position.
You can however use conventional navaids to crosscheck when you are within the DOC.
The best thing to do is to use a chart and knowing where you are now and where you have told the FMS to take you confirm that the track and distance are reasonable.
Regards,
DFC