I really like FET diy Djozz style driver(nanjg AK 47 one). This is the thread about mentioned driver: comfychair-inspired quick+cheap+lazy single-sided 17DD FET-driver (poor man's nanjg92)
I produced and potted over 200 of them. Only few failed because of mine soldering mistake so I would say after several years that they have almost 0 failure rate!
I would like that Djozze reinvents mentioned nanjg AK 47 FET Djozz driver but this time with some kind of added resistance so we can safely run that little osrams… Pretty Please Djozz ? 