I presume the Solaris is powdercoated like older Cotics? You might need to allow for a strip and re-coat as well. Get it dipped before you take it for modification?
Vernon Barker in Dronfield could do the welding/brazing and I’m sure he’d make a good job, but I think he only does stove-enamelling not powdercoating. He did some good work on an old Kona for me a few years ago.
Or try 18 Bikes in Hope if their workbook isn’t full, maybe?
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