Bream didn't publish many of his transcriptions. If you are hell-bent of trying to find one, the only way I know of is to listen very carefully to the recording and notate it yourself. I'm not trying to be snobbish here, but you will find that by doing so you will gain a bit of insight as to how Bream thinks about the music. Before I was able to find a published version of Rossiniane Op. 119, I listened to the Bream recording and notated it. When I finally found his arrangement, I was pretty close.
You can also study some of his published arrangements (Bach Em lute suite, etc) to see how he approaches fingerings.
For myself, I usually find one arrangement (say Malats "Sereneta Espagnola") and play with the fingerings until I get the sound I "hear" in my head.
FWIW, IMHO you will do yourself a favor by just trying to arrange things yourself. It's not bad to copy the masters, but by doing the arranging, you will learn a lot and build your own sound and ideas.
If that doesn't make sense, remember that it is free advice and worth every pence!