How do you make etazene and metonitazene safer to IV?

First off I am a 13 year IV opiate addict never being able to quit. The last 4 years being fentanyl and similar drugs.I am always trying but please spare me any unuseful comments like , "just don't IV it" I am already IVing etazene and I just try to push the plunger slowly to reduce burning sensation but I don't want to destroy.my veins if there's a way to avoid doing so. I have basically no chemistry knowledge so please dumb anything down for me if possible.

I've read conflicting things about various benzimidazoles being caustic or not or being water soluble or not. My questions are:

1. If something burns when injecting because it's too acidic can you add baking soda or some other easily obtained substance? I read somewhere someone doing this but just want confirmation that that's ok to do and actually works. If so then what is the procedure and how much do I use? Does this work for etazene? For metonitazene? Protonitazene? Any drug or a specific one?

2.I think that same person mentioned putting in oven for 1 hour at 100 celsius, also to make it burn less. Does this help?

3. Which of those two processes would make best results? Or should I do both?

4. For something like butonitazene that isn't water soluble, is there a simple process to make it?