it's perfectly fine to burn single layer images to dl per se. in practice dual layer discs happen to have a much lower reflectivity and your drive may have a hard time reading them. that's especially true for softmods or flat cable type hw mods.
chances are a lot better with 5/6/9 wire mods on a d2e or older drive, nevertheless drive conditon and media quality are a significant factor. in order to read +R or+R DL media with a softmod make sure to set the booktype to ROM. always burn at lowest possible speed.
so... if you're desperate give it a shot.
personally i find the utter waste of money/bits hearbreaking. but i've been in the situation before... (sigh)