Not all approach control facilities use strips these days, so no matter what you write, the controller may not know there are relevant remarks to be read.
If this facility does use strips, there is still the chance that another remark put in by your flight plan filing website pushed yours to the end (one of them lists the PICs name in the remarks section). ATC may have put something in there like "FRC TO NDB" which would have cut off most of your remark.
There really isn't a good way to guarantee that ATC will see your remarks. Your best bet would be to reiterate your approach request with the approach control on initial contact.