I have a split ergo (Ergodox) and an ortho (Preonic). The Ergodox is my normal keyboard and has modifiers and a number row. I use the ortho for cad/3d work when my right hand stays on a mouse so I can type commands and inputs one handed. I still don’t have muscle memory fully down to use layers for symbols and numbers but could get there.
CA glue may also work, but test it first as it may melt your keycap material