India and the UK - Trading Places?

This is an interesting article in RUSI regarding the rumor India may be looking at the Queen Elizabeth class aircraft carriers. Shashank Joshi does a great job covering all the bases. This paragraph perfectly captures the issue.

Recent reports of Indian intentions to purchase an aircraft carrier from Britain would not substantially add to India's ambitions to be a global power. However, the rumours are symbolic of India's delicate strategic balancing act as it shifts its focus to China.

Exactly right. One thought. The article mentions India's desire to be on the UN Security Council. I believe this is going to happen, but when it does the UNSC would expand to 7 countries, rather than India outright replacing an existing country. The question is, who would be the 7th country?

Turkey?
Germany?
Japan?
Brazil?

Based on military power and domestic military production, one would think Israel would be the obvious choice, but that will never happen. So who would it be? Germany and Japan are legitimate choices based on economy, but there is a bit of history and policy surrounding those nations. Turkey is the biggest global military power nobody talks about, and Brazil has the potential to be a military power. The issue though is centric to how military power is still tied to nuclear weapons, even though that standard doesn't really apply in the 21st century. It is a tricky question, but one worth considering.