All kinds of aftermarket auto alarms/anti-theft systems out there. Some specific to a vehicle, others universal with a remote keychain FOB.
Talk to your local Car-Toys store for ideas or full installation.
Would be interesting to hear the discounted savings versus cost of install.
Ď91 Ultrastar ChampionĎ02 Georgie Boy Landau 8.1l Workhorse
Ď03 Jeep Wrangler TJ 2018 Jeep Wrangler JK toad