Plenty of bikes are retrofitted with them.

The the better ones with cooling heat sinks (some with a fan) but fitment might be challenging for some models since you might not be able to get the dust cover/compartment to close back. YMMV.

Also just take note, just like cars, retrofitting hid or led on headlights might not be legal. So again YMMV. This is especially crucial for bikes as bikes tend to lack any aiming mechanism so your different beam patten may end up blinding other motorist.

Any halogen bulb with blue tint will only make the light look whiter,  but you will lose usable brightness.
Unless the bulb uses higher wattage, but then this will fry your headlamp wiring.