We don't have a script to change them from non-ssl ingress to ssl ingresses.
Re-install is the Only option because the urls are used across databases and pod env variables, changing them is error prone and not recommended.
Please note the script mentioned in https://techdocs.broadcom.com/us/en/ca-enterprise-software/it-operations-management/dx-platform-on-premise/20-2/installing/reference-information/update-the-tls-certs-for-dx-platform-ingresses.html is for updating the ssl cert for ingresses that already have certs.