This is would be a great project to provide a mature Lisp that developers could use to target WebAssembly.  Guile Scheme is an amazing Lisp to utilize for this purpose. Here are some other Lisp-to-Wasm type projects from my brief search.

-The Wisp project to compile Lisp-to-Wasm: https://github.com/mbrock/wisp

-Chaitin's Lisp- This is a WebAssembly port of Gregory Chaitin's minimal Lisp interpreter: http://weitz.de/chaitin/

-HN post: Common Lisp running natively over WebAssembly: https://news.ycombinator.com/item?id=31590819

Great idea!