I would love to see a sampler kit.
I know it's not cost effective for the consumer but I would have purchased one by now if it was an option. What would really take it over the top would be a kit that you can build... no one knows better what you want to try than you!
I would have tried the Glass Cleaner, SVRT, APC, Interior detailer.
If it came in a small high quality glovebox size bag that held a few all purpose towels my guess is you couldn't keep them in stock!