For those who are dying or near death I often prescribe duragesic patches, which admittedly, is not the "best", but it is effective and is easy for gravely-ill patients to use (no pills, etc). I also generally write a fast acting oral like oxycodone or morphine sulfate oral suspension, PRN (as needed), which is something physicians dislike writing because they are C-II's (opioids in particular).
On occasion I will prescribe methadone in rather high doses, which often works well at treating severe pain that is resistant to other opioids. Plus, given the state of the patient, methadone generally doesn't cause the same degree of cognitive impairment seen with equianalgesic doses of morphine, hydromorphone, fentanyl etc equianalgesic. If there is a 24-hr nurse involved or inpatient hospice, I sometimes try more exotic opioids if the patient has been catheterized and is wired and plugged in (aka life-support/monitors).
Obviously, the goal is to both effectively treat the pain and keep the patient conscious enough to speak and have some final time with their family/loved ones. And no, the Brompton cocktail would not go over well here in the US, my methods are already rather unorthodox. I have, however, prescribed d-amphetamine to younger terminally ill patients (particularly for some of the painfully slow AID's-related complications--->death).