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Most of that should just work.
To change the typescript version, just put the correct version in your _packages.json_ in the normal way.
Microstacks just needs _Pulumi.yaml_ files in all the project directories.
Top-level tsconfig is built-in, just don't have one in the project directory.
Not sure that you want a shared package.json; I haven't looked into that.
I don't know what pnpm support requires; hopefully, just package dependencies or a special loader?
If you need to change the node loader (e.g. to use ESM) you can use the nodeargs option. <https://www.pulumi.com/docs/concepts/projects/project-file/|https://www.pulumi.com/docs/concepts/projects/project-file/>