For a 22’ boat I used hollowback (half oval) stainless steel pre drilled. I bedded it in 3M 5200. Twenty years and it is in great condition, no bending or deflection even where it rides on the front keel roller. TACO marine product. I purchased through Jamestown, but you might get it locally through West Marine or other. Shipping costs will affect your length/source choices.
I have used narrow brass stem bands, solid and oval back, on canoe stems. They look nice but don’t have the strength of the stainless steel I used on the bigger boat.
On a tangent, I just completed a wood strip kayak. I used 1” kevlar band for the stems and for the outside hull-deck joint. Too soon to give an assessment, but it is definitely tough.