How can I run unit-tests and set the system language of the simulator from a script?

Recently I got many complaints that my watch-app (not datafield) crashes at start. It turned out to be a translation bug: some string is too long. I opened this feature request: https://forums.garmin.com/developer/connect-iq/i/bug-reports/feature-request-add-maxlength-maxsize-attributes-to-string-resources-and-fail-at-compilation-if-a-string-is-too-long so we could set a maxSize, maxLength on strings and the compiler would tell us in compile time if some string is too long. But until that feature is implemented... I'm thinking about some workaround.

I wrote this "unit-test":

(:test)
static function validateFieldUnitTranslationLength(logger as Logger) as Boolean {
	var resources = [Rez.Strings.stepsUnits, Rez.Strings.stepsPerHourUnits, Rez.Strings.stepsPerKmUnits, Rez.Strings.stepsPerMileUnits];
	for (var i = 0; i < resources.size(); i++) {
		var res = resources[i];
		var str = WatchUi.loadResource(res) as String;
		var arr = str.toUtf8Array();
		if (arr.size() > 15) {
			logger.error("lang: " + System.getDeviceSettings().systemLanguage + ", str: " + str + ", size: " + arr.size());
			return false;
		}
	}
	return true;
}

It works, but I'll need to run this in all the existing languages. For that I'd need to do the following in VSCode:

1. Run any app
2. Set the language
3. Run the unit-tests of my app
4. because now I can't change the language of the simulator (it only displays "Not Set") I'll need to goto 1.

Is there a way to do this from a script? Something like:

for lang in [ara, eng, hun] {
    setLang(lang)
    runUnitTests(fr965)
}