Great thought of the delay relay. I would use the lock power to trigger the relay. I would use the contacts of the relay to mimic a door switch with a latching relay so when times up it opens up. This way your dome lights will kick on and you can run a wire over to the map lights to activate them as well if you wish.
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html