Doing an SA in 2025 but graduating with a 1 year masters in 2026 - am I still allowed to do it as a masters' student?

Hi, 

I am going to be doing a masters in the UK starting September 2025. The course is not an MFin or a Finance masters but I graduated from a target school last year after having a traumatic undergraduate experience (read below). 

I have mitigating circumstances because I was a carer during COVID. I worked basic jobs in groceries to support my family and keep them going. I've only just started to open up about it after having an interview elsewhere and realised my situation is unique in light of the trauma I've suffered. 

I read that for IB internships at EB and BBs that it is open to penultimate year undergraduates only. However, I don't know if this is always true because some masters' students from my university still get onto these SA programs (think JPM, GS, MS, PWP, CVP etc.)

Obviously, with my circumstances, it's a bit different because I have a reason that I never did an undergrad internship. If I had done one, I wouldn't have been able to support my family while my parents were receiving treatment. Now, extended family have moved to London to take care of us so I am able to now resume my career. However, I can't do an MFin or Finance masters' because I come from a low socio-economic background and scholarships won't cover the £30k fee I would need to pay to cover the remainder. I was thinking to reach out to HR next year to see if I can still be eligible and have my application flagged in light of my issues. 

Does anyone here know if you can do an SA internship before you start your masters? If so, how does that process work?

I posted previously regarding S+T careers (hence the profile tag) but since the IB process is slightly different only towards undergrads, I wanted to post this second question for clarity since little info is available to find out more.