"I don't think I would like it much jaja, when our MSA is FL220 and our escape route requires fairly precise tracking. Have a look at route L888 for starters."
Well, the ADM system on the CITATION is not new. With todays EGPWS, is should not be a problem. Just let database of the EGPWS "talk" to ADM system, to keep you safe in those few areas where FL150 is to low.