uv actually does have a reimplementation of pipx, via uv tool or uvx: https://docs.astral.sh/uv/concepts/tools/#tools

the concept in the OP is different; it’s an implementation of pep722 https://peps.python.org/pep-0722/

he wasn’t actively wearing/using the ring while in the shire iirc

sadly no; position of hint is determined by the LSP server.

you could use this plugin (now archived) which was the way many people used hints pre-0.10:

https://github.com/lvimuser/lsp-inlayhints.nvim