GTV to ILR Dependent visa for Spouse

Hi,
I have lived in the UK for more than 3 years and have been on Tier 2 Skilled Worker Visa.
I am making an application for GTV under exceptional Talent Category. Provided I get endorsed, as i understand correctly, I can apply for an ILR right away after but the steps for visa application will be
Step 1: Apply for GTV
Step 2 : Receive the GTV
Step 3 : Apply for ILR

However, what I am not sure if how does the visa status for my spouse who is dependent on me will work, will I have to
a) First convert her dependent visa from Tier 2 skilled worker to GT Dependent visa and then to ILR dependent visa? or
b) Can we go straight from Tier 2 Skilled worker dependent visa to ILR dependent visa?

I understand that there might be sometime in between the visa categories and such but has anyone tried avoiding the double documentation and application process. Is that even possible?