I’ve done similar repairs using JB Weld. As long as you prep it well it can be essentially permanent. Not very elegant but needs must!
https://www.ebay.co.uk/sch/i.html?_nkw=F...&_osacat=0
or put out a request for a tank in silver on partfinder - https://partfinderuk.co.uk/
https://www.ebay.co.uk/sch/i.html?_nkw=F...&_osacat=0
or put out a request for a tank in silver on partfinder - https://partfinderuk.co.uk/

