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Been there. Tried that. And failed...
The hole is non standard. I tired 90 degree billet aluminum valve stems from Kurvey Girl and another supplier whose name I've forgotten and neither of them fit properly into the recess on the rim so I could not get a good seal.
If you find some that work let us know. It sure would be easier to top up the rear tire with a 90 degree stem like the newer models come with. The only guy I know who succeeded in doing this on 1100 rims had a machine shop...
I used a 11.3mm valve stem for the rear wheel on my 2010 R1200RT from https://www.americanmototire.com and it works just fine. Let me know if you want pictures.