Welcome to NeuroTalk:

Once a doctor knows about a drinking history, they typically label you and do not look further. A delay in onset, does not really seem likely to me.

Most treatments for alcoholism restore vit B balance. When that happens, the neuropathy usually goes away. Alcoholics often have nutritional deficiencies which may cause the PN in the first place. Alcoholics who eat well often don't develop PN at all.

Start off now, with a B12 test, and Vit D test to see if you are low.
Get the numbers and report them here, as doctors use outdated lab ranges which are low, and call them "normal".

Also get a long version Glucose Tolerance Test to see if you have impaired glucose tolerance. This can be quite difficult to tag and often people have it with normal fasting morning glucose results. As the process continues, PN develops slowly over years and may eventually lead to Type II diabetes.

You need to live in the present to help yourself now. Being assertive and your own advocate will get you much farther, than accepting a historical diagnosis which may not be 100% your cause of PN.

I see in your profile you list back pain... as a problem too. Back issues can give neuropathy sensations in the legs/feet...so do have that taken care of too.