I bought my bike with 900 miles on it. Previous owner had Triumph throwover bags. The top of the rear fender is scuffed from them. I bought a set of bags and cut yoke off, reinforced backs and bolted them solidly. Takes 10 minutes or so to remove them.
Triumph saddlebag brackets will support soft bags for $177 I believe. Honda Magna brackets will fit for about 1/3 the price.