Isnt one option a brazing torch and filler rod ? never tried it but saw one the other day and thought about it. im guessing you know its vital to drill little holes at the ends of the cracks to prevent them spreading and maybe get a sheet of 0.xmm steel whatever thickness it is to practice on. Also +1 on wanting to see this alive to ride another day.
Isnt one option a brazing torch and filler rod ? never tried it but saw one the other day and thought about it. im guessing you know its vital to drill little holes at the ends of the cracks to prevent them spreading and maybe get a sheet of 0.xmm steel whatever thickness it is to practice on. Also +1 on wanting to see this alive to ride another day.