It's worth exploring whether we can use Dynamic Imports to import the Keycloak module. This would save us having to build a wrapper.

Useful reading - https://nodejs.org/api/esm.html#interoperability-with-commonjs

A suggestion might be to create a asynchronous loadKeycloakModules() function that is called in this style:

{{async function loadKeycloakModules() { }}

{{const

= await import('@keycloak/keycloak-admin-client');}}
} 

The ideal outcome of the task would be a draft PR to https://github.com/janus-idp/backstage-plugins that uses this method of loading.

It may be easiest to start with updating to @keycloak/keycloak-admin-client@19.0.3 to test the ESM interoperability without having to account for the breaking changes between 18 and 25 (the latest major version).