Benzos can help sedate you and sedation is very important to be able to overcome SI. So, to answer your question, yes, they can help with overcoming SI.
If you have been taking these medications for a while there is a chane that you have developed a tolerance against these medications. Therefore, it'll be necessary to test the dosages to see which ones work best to sedate yourself to make sure you have found the best dosage.
Please be safe when carrying out your method. If you want to stop, please, stop. Brutal methods are never easy and very dangerous in the case of survival.