luckless VS Eclector

You mean, speaking in CL terms, gethash and setf gethash? These, again, are just functions that work on a hash-table-like data structure. See e.g. Luckless for an implementation of a hash table that's additionally lock-free (and therefore should work in presence of multiple threads).

I think this should be safe: https://github.com/phoe/safe-read

This doesn’t provide such functionality out of the box, but it makes it pretty trivial to produce a custom READ that only has the features you want: https://github.com/s-expressionists/Eclector

There is significant overlap with SICL and its associated pieces which supply many of the other parts needed to make a Common Lisp. Some of these are Cluster which provides a portable and extensible assembler, Eclector which supplies a portable and extensible reader, Concrete-Syntax-Tree that supports source code tracking during compilation, ctype that implements the Common Lisp type system, and Clostrum that provides first-class environments for e.g. run-time, evaluation, and compilation. The SICL project has as one of its goals the creation of portable infrastructure for implementing Common Lisp, and these pieces are novel building blocks that were created as part of the project.

You mean the parts of the reader that is capable of reading from a stream object and returns strings, booleans, numbers? These are just functions that accept a stream and they return Lisp objects. See e.g. Eclector for an implementation of a Lisp reader as an external library.

I'm aware of eclector; hoping to take a look some day.