What would you be looking for in a less bloated CRM? I have considered writing one as a starter for clients but not sure what features to include.
You mentioned they need to track inventory! Are they looking to do that across multiple sales channels?
I built Trunk[1] which would centralize their inventory and sync it in real-time across everywhere they sell (e.g. Etsy, Shopify, Faire, eBay, Amazon, Square, Squarespace, etc.). If they also need to track their bundles/kits, Trunk can do that too.
Feel free to visit the website and chat with me (bottom right icon)!