I seriously doubt that you will get that within the allotted timeframe.
If the house has never had a traditional POTS phone line/subscriber, there will be a wait time to have the house referenced nationally. I’m not even 100% sure that you would be able to do this over the phone, you might have to physically go into a telecom store and discuss it with them, as the phone sales services are usually woefully over-enthusiastic as to what can be done, and will promise you the moon if they think they can get a contract out of you.
I can give an example, albeit, the person in question is French, and doesn’t have the issue of non-dom residential status and banking. Our new next door neighbour, for the house he has been doing up which already had a POTS phone line, but with no phone contract for more than 10 years or so, went to enquire about broadband for the house. He discovered that the house wasn’t referenced with Orange. The house had also been recently allotted a house number (similar to ours, we didn’t have one when we bought our home and the mairie gave them out some 3 years later). He has had to go through a two-step process: (a) having the house address referenced (there must be some kind of national database that handles this) for availability of a telephone connection of some kind (whether fibre or traditional) - this has taken about 6 weeks since he went in to the Orange shop, and (b) a second referencing of the house for fibre broadband (no more ADSL is being offered for new contracts in our hamlet because we have fibre infrastructure). This second referencing still hasn’t happened - now 2 months and counting since he made the request by physically going into the Orange shop.
Similarly, for some odd reason, our own house wasn’t referenced in the database that Orange uses for recognizing existing phone line connections, despite us having had an Orange ADSL contract for over 3 years. I had to specifically file a separate request (email) with the local territorial agency responsible for broadband roll-out and indicate the plot number of the property and some other code that was given to me by Orange (presumably some basic reference that they had access to internally). Even that process took nearly 2 months.
If you are not going to sign up with Orange, quite understandably, they won’t be interested in giving you those references. BTW, you can just sign up for broadband with Orange, you don’t have to take out TV or mobile phone contracts on top.
If you don’t have fibre broadband where you live, then getting ADSL might be difficult if a fibre deployment is already planned, as none of the telecom providers want to be installing POTS infrastructure when the onus is on them to start removing it more generally, in favour of fibre (or some other broadband solution, such as satellite or 4/5G).