Plenty of options for Highway pegs on a Valkyrie.
Just remember that the Valk engine guard is 1 1/8" when you buy a clamps & peg set up.

I am one of those weirdos that LOVES the "feet underneath me" riding position of the Valk & I rarely use my highway pegs. The wife is opposite, she uses her front mounted highways all the time. She also has the Cobra floorboards instead of the stock pegs which is another option you can use.
Forward controls are also available for the Valk if you are so inclined.

Everyone is different, make your Valk fit you!