Why would anyone think this is your fault? We all experience financial woes - especially considering the excessive cost of MMT. And, you have every right to be proactive about your treatment, which any decent provider should consider to be the responsible way to act.
First, fighting best practices and regulations are difficult. Clinics can be more restrictive than regulations, which are not laws. And, only clinics that are decent and fair care if they follow best practices. The way to fight them is by their own policy.
I think the most valid points are:
1.) You do not have to taper until you cannot pay. It doesn't matter whether they feel that you are in financial trouble and inability to pay is eminent. You are able to pay daily, and they cannot say for sure that next week you will be unable to pay each day.
2.) You have EVERY LEGAL RIGHT to have the doctor's orders IN WRITING. You are not required to accept a verbal order from anyone else. Ask them for a written copy of this order 'for your records', and because your physician wants it in writing so that if something happens to you during this inhumane taper they know the speed and rate of the taper, as well as have written proof for their files.
3.) Be sure to point out the clinics own policy regarding a 4 day taper for fighting. You should not be penalized for inability to pay.
4.) As you noted, an ethical taper should be based on dosage and percentage. Asking you to taper 25% daily is insane, and it is unethical to not consider dosage when planning a taper.
Do you have any medical conditions? High blood pressure? Seizure activity? Heart issues? Anything that could be exasperated by this taper? If so, certainly mention his to the doctor and maybe get a letter from a doctor stating that a fast taper in not advisable.
Also ask him if he can provide you with prescriptions for anything that may help. Ask if they can transfer you to a clinic that is sliding scale or help you apply for Medicaid.
Lastly, be sure to save any emails you have from methadone authorizes stating that this is not acceptable, and that they are required to provide a humane taper. Mention who you spoke to by name if you were told this by phone. Make sure the doctor knows that you do not want to be difficult, but are trying to be proactive about your health, which is why you stopped using and got on MMT. Explain that you only want a fair and humane taper, and that you do not think it is unreasonable to request a copy of this order in writing.
Good luck - let us know how it goes:)