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Along with the documents which the Home Office requested, you may write a letter explaining that you will be getting married very soon and provide evidence of that as well if you have any.
Unfortunately, the Home Office makes a decision according to the documents and facts they have in front of them at the time of the decision-making process. Therefore, if a visa is refused only based on the relationship requirement, only one way I see is to apply for a married dependant visa after you are married.
Now, please make sure not to confuse two terms with each other. A spouse visa is a completely different route under the UK immigration Law, it is not applicable to your partner at present.
If you mean Tier 2 dependant visa once you are married, then, of course, no one can give you guarantees that it will be 100% successful, although, if the only reason for refusal for the current application will be based on a genuine relationship test, the marriage certificate will definitely be a piece of strong evidence for this and I do not see a reason why the Home Office will refuse again after providing marriage certificate with all other supporting documents.
I understand, if you will explain the whole situation to the Home Office, it is under their discretion, to be honest about what decision they will make.
Try also to submit a few pictures and any travel tickets, hotel bookings if you traveled together somewhere.
My pleasure! Good luck!