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.gaz.-
Other than the FD, do you know if the GRX chainset work with 11 speed 105?
GRX 11 speed works just fine with other Shimano road 11 speed. For example you can use 105 shifters with GRX derailleurs. You just need to pair the GRX chainset with the GRX front derailleur.
But apparently @velosaurus 's experience is an Ultegra derailleur works just fine, so maybe it's bullshit.
Tijs
Keep in mind you need the GRX front derailleur in this case, because of the 2.5mm wider Q-factor to make more room for bigger tyres.