Sorry CogitoEerilySpooky I am going to have to disagree with you - I'm in exactly the same position as the OP with DW. Yet again I found one of her debt bombs this morning. This is going to be a long post so sorry everyone.
Like OP, DW (sorry OP if I'm projecting here) is absolutely incapable of understanding money flow and the downstream impacts that things like PDL's cause.
If I give DW a list of things that she must pay for like travel pass, mobile bill, etc it just disappears out of her head.
So is a relationship termination called for (rhetorical question)? I believe not! I've come to the conclusion after nine years of debt turmoil that DW suffers from something like dys-numismatics (numismatics is the study of currency) and unfortunately DW is dyslexic when it come to cash and debt.
I do believe that money blindness can be cured, its tough, its hard on the people who don't have it to understand it, taking this quote from wikihow
"The modern advancements in the field of medicine and technology have given us an array of therapies, training and equipment that can be used to beat dyslexia."
Therefore, similar techniques can be harnessed to affect a change in how someone understands money.
To start answering OP question. Sorry no there is no register. If someone wants to lend OP DH money they can - in financial terms its called Risk. Even if OP DH is bankrupt a lender can evaluate the Risk and lend money (As with Pay Day Loan's, hence the high interest rate). Sadly, there is nothing that can be done to prevent anyone from acquiring debt.
So sorry you can't fix that particular problem. But what can be done? This is where education plays a part. Somehow you need to find a way to re-educate DH about money.
By the end of June, I paid off £5+k's worth of debt that DW had, it was my choice to bail her out, since then another £2.5k's worth of debt has been run up. As times it makes me really dislike her, and I can be unsympathetic (perhaps OP you may recognise those feelings). But, for better or worse I chose to be with her.
Some will say, its not down to me to manage her financial life, but it is down to me to ensure that the family's financial life is managed and if I was to walk away from this problem, I'd still worry about it. So, from that perspective, I prefer to be close to the problem so that I'm better place to manage and help. Some may also add that I'm a toxic enabler, that as I keep on bailing her out I'm not letting her stand on her own two feet.
So what actually can you do? Well, I think you are actually doing the right things. What you describe is exactly what I do with DW, with an extra dose of nagging about what we could do, if the debts didn't occur. EG a long six star holiday, a car, etc.
You have to find a motivator to help stop him from the debt cycle, You also need to find a way to make him understand that when he borrows money he has to pay more back.
I hope you don't feel that I've hijacked your post, by stating the situation I'm in with DW, it just that your not alone dealing with problems like these and I don't think that severing all ties, legal or otherwise will really help you or those around you that much.