These LSTs could get underway within 48 hours and offload combat ready vehicles directly on any beach or port within a few days. The LST could remain to provide fresh water, hot food, fuel, a medical facility, worldwide communications, and a helicopter landing pad. If the situation changes for the worse, the LST can pull out the task force. LSTs can make surprise landings at night in complete silence, until the roar of tank engines coming down the beach alarms the locals. Of course mines can threaten ships, but there are no sea mines in place in the world today.
Rapid deployment is usually to help friendly countries anyway.
Deployed carrier battle groups can protect LSTs from air and naval threats. However, the U.S. Army has ample forces with no means of rapid deployment. The U.S. Navy will hate this idea since it prefers to spend billions of dollars each year to keep dozens of submarines deployed overseas which have almost no utility. The U.S. Congress will rightly complain about roles and missions, so the Army could then offer to provide annual funding for 750 LST sailors, and offer to pay the operating costs for the ships. It will take strong civilian leadership to force the unprofessionals in the Pentagon to adopt this practical idea.