>>1475301Tough spot you're in desu.
I have made the decision to build pic related, 64cm surly lht. Currently running 35c tyres. Cantilevers instead of callipers but what can you do, does the job nevertheless.
The only bike that you could get with similar geometry would be a trek domane al, can run with wide tyres and mudguards, also cheap. Wouldn't be such a boat anchor as steel too.