What are some options (besides buying all new components) for my sticky, cracked dash and door panels?
Carpet type dash mat like this. Autozone, O’Riellys, etc should be able to order for your car.
Door panels, I don’t know.
There was a 10-year extended warranty by Lexus for this problem. but you missed it by a couple of years.
The Infamous Lexus Sticky Melting Dashboard Problem: What Options do I Have? - The Track Ahead
you can cover the dash like mentioned above. there are videos on Youtube about replacing the door panels. like this one.
HOW TO FIX LEXUS IS250/350 STICKY DOOR PANELS! (youtube.com)
some have re-wrapped their doors.
Lexus Door Panel Wrap IS250 (youtube.com)
And here is someone using acetone to remove the stickiness
. Lexus IS300 sticky dash fix/removal using Acetone method - YouTube
They do make dye/paints for plastics and for leather that can be used after you get the sticky substance off.