What are the best deployment tools for Helm charts without GitOps?

I'm working on a deployment toolchain for our in-house software, which consists of several microservices running on multiple Kubernetes clusters. Each microservice's artifacts, including Docker images and Helm charts, are uploaded to Sonatype Nexus for deployment. My goal is to create a solution that allows non-developers to easily deploy our software via a user-friendly interface, ideally a web-based tool, without relying on CLI tools. Here's what I need: - I want to deploy all Helm charts (i.e., microservices) for a product in one go, ensuring each chart has the correct version. This might involve bundling strategies like umbrella charts or helmfile. - The tool should allow operations teams to start, stop, or restart individual microservices, either by adjusting replicas or redeploying them. - It should also let us restart all microservices easily. We're constrained by needing to manually trigger deployments after passing large-scale acceptance tests due to legal reasons, so CI/CD isn't an option for us. The workflow would include generating a manifest of services and versions that can be fed into our deployment tool. Does anyone know of tools that can meet these requirements, or are we stuck building something custom? How do enterprises tackle Kubernetes deployments without GitOps or CLI?