Looks like the subshell for that xinput call is extraneous

.config/srandrd.conf

@@ -4,7 +4,7 @@ maptouchscreen() {
 	# maptouchscreen <name> <output>
 	local name="$1" # <name> should be a full name from the output of `xinput list`
 	local output="$2" # <output> should be an xrandr output name
-	xinput --map-to-output $(xinput list --id-only "$name") "$output"
+	xinput --map-to-output "$name" "$output"
 }
 
 setpasink() {