I'm glad you're aware of the legal requirements of some countries. However, you will face many hurdles if you require all of the mentioned currencies to be active on UDC for your project to go forward. Expect a long road ahead. You should think about how you can program it for one currency first, deal with the legality of your system on it, and then expand to other currencies.

UDC is not a decentralized currency, as you claim in the abstract. There is a central entity of issuance. There are many points like this that require further review of your text and ideas.
You never mention why UDC is better than current payment processors in the related work, yet you compare to them towards the end of the paper.
You also never mention why the problems that have occurred with decentralized cryptocurrencies exist, while you describe them.
You don't mention how UDC deals with fiat currency fluctuations, which will be a huge issue for exchanging.

When you are in Lisbon lets meet. I would love to talk to you about your project.
I am sure you will have a great master's thesis, if you are using UDC for it.