Best bet is not go down the codeine or dihydrocodeine route. However if are going to use (cold water extraction) before you end up with stomach, liver and renal damage or worse from ibuprofen and paracetamol. There are lots of posts on CWE however I'll post what I did here.
1. Put some ice in water, I used 50ml for every 20 pills.
2. Crush all the pills into a powder.
3. Put into the water and stir until all the ice is gone.
4. Put into the freezer for 5-10 mins. I never let it freeze over.
5. Put two coffee filters together, wet them, put them into a funnel over a container.
6. Pour the mixture in and patiently wait.
7. Drink the results.
N+ is not good for CWE, it takes for ever to go through. Paramol by it self takes a while to but mixed with other pills it is quick. I used a mix of cuprofen plus (200mg ibuprofen/12.8mg codeine), solpadeine max (500mg paracetamol/12.8mg codeine) and paramol (500mg paracetamol/7.46mg dihydrocodeine). Cuprofen plus seems to have some kind of wrapper on it which you can pick out of the crushed pills.
Again it is best to stick with kratom rather than go down a route that sees you on a course of suboxone.