Daytime Running Lights (DRLs) being mandatory in Canada for coming up to 30 years now, The Big Three lobbied governments to enact legislation that allowed any colour that would otherwise be legal on the front of a vehicle to be a legal colour for DRLs. So, you can have Yellow DRLs. But you still must have the proper white-ish Colour Temperature for Low and High Beams even if your DRLs are Orange or Yellow.
Still, if you are resident in the US, it would pay to check the state legislation on the matter. Some states only require that the vehicle meet Federal Motor Vehicle Safety Standards (FMVSS) when on the dealer's new car lot, and anything goes (almost) after the vehicle is delivered to the retail customer. (For the record, all Canadian Provinces require all road-going vehicles meet (Canadian) FMVSS at all times).
This was done so that early implementations of DRLs for Canada Domestic Market (CDM) vehicles could use the identical hardware as United States Domestic Market (USDM) vehicles, with DRLs implemented in the wiring harness only but using the same bulbs, reflectors, lenses, etc. as non-DRL models.
On a practical basis, I agree that Yellow supplemental (Fog) lamps mounted low is the way to go, even if it's discovered that in your local jurisdiction you could run Yellow HiBeams legally.