Potential In Year Change of Circcumstances

I hope you're well.
I’m writing to enquire about the implications of a potential change in circumstances.
I am considering moving in with a partner. Due to the nature of our individual leases, this would probably not take effect until mid April.
I do an intense NHS course with at least 14 weeks of unpaid full time placement hours, so massively rely on the childcare grant element.
I won’t commit to this move until I am sure that I will not face a large overpayment for 2024/2025.
I live outside of London, and my rental obligation would probably increase to around £1,250.
CURRENT AWARD
[Of Which the Special Support Element equals] : 4,327

1. If my new household income between when we theoretically move in, (circa April) and August 31^st (end of academic term) is 16,625, then will I remain entitled to the PLA and the Childcare Grant?
2. I believe that I would lose eligibility for the Special Support Element (£4,327). Would I lose it all, or would it be pro-rata’d down so that I only lose it for the months that we cohabit?
3. Is 31^st August the cut off for 2024/2025 household income determinations?


I think that my new award would be*;

*Based on household income of 16,625, before tax/NI/personal pensions deducted.
Would you be able to comment if this is accurate please.
Many thanks for your time and input,