I know that you said that you don't have access to mustard seeds, but do you have access to brown mustard?
If so, as per
https://www.leaf.tv/articles/dijon-mustard-substitutes/
Quote:
If you happen to find yourself in need of Dijon mustard but don't have any on hand, you can put together a similar mustard from common kitchen items. Use 1 part each yellow and brown mustard seeds, 2 parts dry white wine, 1 part white wine vinegar and salt to taste. Marinade the seeds in the wine and vinegar for two days, then blend or mix the other ingredients in a mortar and pestle.
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Oh. Never mind. Sorry. It says "seeds."
But I'm wondering if the wine is the key to making a quasi-Dijon out of yellow.