The reactive programming idea reminded me of Ken Tilton and "Cells", which exploits the flexibility of CLOS (the Common Lisp Object System) to create a reactive programming language on top of Common Lisp.

https://github.com/kennytilton/cells

and he has slides from a talk

https://github.com/kennytilton/cells/blob/main/Lisp-NYC-2018...

to give context.