An other way is to ignore the word game and just use the tremendously mature McCLIM. https://codeberg.org/McCLIM/McCLIM . I think in some respects it is light weight. I wrote this silly thing in it a long time ago:
https://lispy-gopher-show.itch.io/lispmoo2/devlog/891545/gui-table-of-unicode-co...
Support for drawing is good. It's idiomatic, but the CLIM spec idioms are very mature and the support for images (see the Examples/ directory) is very good. https://codeberg.org/McCLIM/McCLIM/src/branch/master/Examples/image-viewer.lisp if you can use common lisp you can basically use McCLIM.