aluminium glazing bars

Hello knowledgeable people, Looking to replace steel frames single glazed windows. They cannot be refurbished. Most windows are fairly straight forward for a heritage aluminium frame. However… we have two larger bow windows each made up of five windows, each is arched. Aluminium company cannot...

Has anyone bought/used self supporting aluminium glazing bars for conservatory/patio roof? I have investigated the wood joist route with screw down glazing bars, but the self supporting aluminium things seem tidier... if not more expensive. Just wondered if there were any alternatives to...