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What knowledge are you going to buy?
If I've got £10k to spend it'll be spent testing as well as on some obvious kit choices. The whole point of the aero testing is to find out if the new position and the new kit would be faster or not.
Also, if you're changing your position, it might be impacted by kit choice so you still have to do it all at once anyway, unless it's a zero interaction part like aero skewers or something.
Testing a new position, for example, might dictate you need new bars. That new position then should then be tested with a new helmet and skinsuit. I don't see how you can buy "knowledge" to "know" these results.
hippy-
One of the usual suspects, most of them do consultancy.
Yes they will probably want to try to sell you products/tunnel time but you might narrow down that actually you are only worth focusing on. It's like buying a load of stems and saddles, trying them out, then going to get a bike fit.
EDIT. Ah you added more to your post. Yes position and kit are interlinked but unelss you want to spend 30 hours in the tunnel, you should probably just accept getting close enough on both sides.
onyerbike
No I would spend on buying knowledge and then figure out if you need tunnel time and only last, buy new shit