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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.
If you have cash you buy watts AND testing time though.