Okay. Then I would go with my original suggestion.
 
A small update:
We have now test-laid a small section. Glued the subfloor, laid the first 12mm chipboard and screwed it down. Then glued the entire board, laid the next 12mm board and screwed it. Tested laying a loose floor chipboard on top. It was as stable as concrete to walk on, so we'll go with this.

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