You are conflating issues. The issue is NOT prescription vs heroin for OD deaths. You are correct that it can be more difficult to OD on opioid/Tylenol opiates, particularly the 5/whatever. You are wrong when you conclude Prescription opioids don't result in many deaths.
the items that result in OD deaths are almost always non combination products (morphine, hydromorphone, oxycodone, fentanyl, etc.). With the exception of oxycodone, all of these are SIGNIFICANTLY more potent via Iv than orally. Both hydromorphone, oxymorphone, and fentanyl are 2x, 3x, 30x more potent than heroin. The deaths often result from IV usuage as well. There would be far fewer heroin deaths if it were taken orally as well.
I completely agree opioids should be more, not less available. That said, you are largely spouting nonsense.