At frogdesign we had a one day bootcamp for startups and before they even showed up, we had them fill out a deck, asking a range of questions, screenshots, etc. It was a lot of work, but they understood it was the prework necessary for a concentrated day workshop.
We could have a much lighter process with a checklist of things to consider (e.g. “Are you only asking for Icons?”) or even suggested design tasks for them to ask about (e.g “Do you have a Journey Map for your product?”) The goal being to give them a range of UX activities they could be asking for.
Sounds like Eriol has already started this which is great news!