Tuffy Security makes things like that for Wranglers (and you can get them keyed alike. I have one key for 4 locking containers). Unfortunately, they don't seem to make anything Liberty specific. They do have some universal stuff that may be made to work:
I thought sure they used to offer custom made stuff. It was INSANELY expensive...but could be exactly what you want. I don't see an option on their website anymore.