After talking with @0xBaer and @jengajojo, I’m moving this proposal to Ecosystem. Requests for deployment of Safe contracts on other chains is not under Scope of Governance of SafeDAO and therefore cannot mature into a valid SEP. See the governance framework. @John also mentioned how the core team is prioritizing right now deployments.
A future path to support these requests could be to incorporate them as strategy under the Resource Allocation Framework so that requests for deployments could be funded as initiatives. However, this would be to fund deployments by the ecosystem not from the core team.