AFAIK the only way to use buildkit is to specify the DOCKER_BUILDKIT environment variable or use buildx. Some tools such as VSCode only use buildkit if buildx is available on the command line (https://github.com/microsoft/vscode-remote-release/issues/1409). I require VSCode to use buildkit for my tool "debpic" (https://github.com/aidan-gallagher/debpic) which allows developers to develop debian packages in a container.
I think this could be maintained by the same team that packages docker.