I wouldn't have him trimmed, maybe just around his feet. It's worth persevering with his coat. A stripped coat is much easer to to maintain than a clipped coat. It's just that it's an ongoing excercise.
You could wind an elastic band between the teeth of a normal comb, and when the coat is ready, you'll be amazed at how much this pulls out.
Both my girls were hand stripped at around 12 months and it took 2 sessions each to see some sort of shape develop.
They are both occaisionally clipped now, but 'cos they were hand stripped initially, when their coat does grow back, it grows back as 'fur' and not 'fluff' if you know what I mean, and they still look sleek and shiny.