If this rose was truly bred from Geoff Hamilton then there is a possible solution; however, not knowing the seedling parent’s traits makes it hit and miss. In California, most David Austin roses can be pruned hard after every bloom cycle. The small twiggy growers such as Pretty Jessica, Fair Bianca, Tamora, or Sister Elisabeth would be an exception. In the commercial cut flower industry I have seen Geoff Hamilton maintained at about four feet in height in open field rows. The budded plants are very well fed, mulched, and on drip irrigation (Geoff Hamilton is a very thirsty water hog). Side flower buds are ruthlessly broken off to get huge goblets on two to three foot long single stems. Cutting off the long stems is equivalent to a hard prune and provides several advantages. It keeps the plant in check, reduces the dreaded octopus canes, and increases the flower size. This same cultivation method may also work for Earth Angel.