try aliasing proot in place of chroot? idk if this will work

build-iso

@@ -26,6 +26,13 @@ function install_archiso {
 	fi
 }
 
+function install_proot {
+	if ! type proot >/dev/null 2>&1; then
+		curl -L https://proot.gitlab.io/proot/bin/proot -O /usr/local/bin/proot
+		chmod +x /usr/local/bin/proot
+	fi
+}
+
 function prepare {
 	install_archiso
 	[ -d "$build_dir" ] && as_root rm -rf "$build_dir"
@@ -79,6 +86,7 @@ function pubkey_config {
 
 function build_iso {
 	temp_dir=$(as_root mktemp -d)
+	alias chroot=proot
 	as_root chmod 755 "$temp_dir"
 	as_root mkarchiso -v -w "$temp_dir/archiso" -o "$build_dir"/out "$build_dir" && echo "ISO build complete"
 	as_root rm -rf "$temp_dir"