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Significance of A Level Resits in Scottish Flexible Degree System

This will be a very long winded and complex question so bear with me.

I am aiming to enter into a Scottish university this September and am aware of the ‘three subjects in first year’ system where I am allowed to take two alternate subjects in my first year alongside my main (provided I have the necessary grades to do the two alternates etc). I have also heard that this can lead to a complete shift in degree to one of those alternate subjects if one does enough modules and requests to follow one of the alternate subjects to honours level.

Once I am in the Uni, I am interested in how A level resits will be considered. I already have my original A levels (I am on a gap year) and am dissatisfied with one of the grades. I plan to resit one of my A levels alongside a completely new A level subject in June (when I will likely have all my responses). This new subject (and the resit subject) , with good grades, would grant me access to the alternate first year subjects that I want to pursue, if they came about naturally in my original set of A levels. How much are these resits really valued or considered?

Within the context of choosing two alternate subjects for first year alongside my main, will these new grades grant me access to those alternate subjects that may have been off the table with my original A levels, or will they be deemed insignificant, even in this context? It is not as if I am adding them to my application on UCAS for access to my main subject, as they would only be for these alternate first year subjects (that I may want to pursue further).

For example, imagine I studied Sociology, English, History at A Level gaining AAB respectively. My main subject for the uni is Sociology and I want to study History as one alternate, but A in History and a pass in Politics is required. (This is obviously a theoretical example, the politics bit is unlikely to be true). Could I make up for this by retaking History while also taking Politics in June, achieving high grades?

or will I be forever restricted from taking this alternative subject regardless of what I resit/sit?

I know this is annoyingly long and wordy but any help is really and truly appreciated. I am willing to clarify anything unclear in the replies.