I already commented on the wiki, but I would like to add that a new scheme need to take in account more the crossings, since some towns (or at least 1 town) used the same idea for stairs:

For example, in Nantes (France): https://www.ouest-france.fr/pays-de-la-loire/loire-atlantique/nantes-marches-des-fiertes-c-est-quoi-cet-escalier-arc-en-ciel-5961061

In Rennes (France): https://www.20minutes.fr/societe/2520323-20190517-escalier-arc-ciel-rennes-2-lutter-contre-homophobie-transphobie

Or in Kelowna, BC, Canada: https://equity.ok.ubc.ca/news/updated-rainbow-staircase-reflects-diversity-of-the-ubco-lgbtq2sia-community/

And sometime, they are not linked to LGBTQ+ struggles, like in Aberdeen ( https://www.eveningexpress.co.uk/fp/news/local/rainbow-stairs-add-a-splash-of-colour-to-aberdeen-city-centre2/ ) or Istanbul ( https://thirdeyetraveller.com/rainbow-stairs-in-istanbul/ )