Personally I would buy a couple of kilos of rice.
Put the notebook open with keyboard open into a big plastic trash bag.
Pour all of the rice into the bag covering the notebook and close the bag.
Leave it closed overnight. That should absorb any remaining moisture.
That will put your notebook out of use for only one night.
The next morning you can take the notebook out of the bag.
use a vacuum to remove the dust and rice grains from the keyboard and ports.
Use a USB keyboard to finish your week's work and then send it in for repair.
HP Keyboard part number is 801508-001
Here is the HP Partsurfer page for your notebook
https://partsurfer.hp.com/Search.aspx?searchText=N1R85UA
Here is a search I did for the keyboard assembly for online vendor sources
https://www.google.com/search?q=HP+801508-001&rlz=1C1CHBD_en-gbNL856NL856&oq=HP+801508-001&aqs=chrom...
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