Distrobox is your friend. Me, I like an immutable OS (kinoite) but I still want the AUR...
distrobox-create --name arch --image archlinux:latest
distrobox enter arch
install yay as normal
yay -S vscodium
distrobox-export --app vscodium
yay exa
distrobox-export --bin /usr/sbin/exa
exit [back to kinoite]
exa [works]
vscodium [works, has icon in application launcher]
Try it, you might like it !