Look
here.
Basically it shows you that the SVA doesn't have the realtime capability, because it doesn't have the necessary HW.
If you are willing to pay the X-R price, I think Siglent can create a "special" SVA for you.
Look
here where I posted the inside of a SSA X-R. For those that have seen SVA/SSAX+ you can see that the HW is different.
Apart from BW all these models have identical SA capability: SSA3000X Plus, SVA1000X and SSA3000X-R.
Well, maybe SSA3075X+ is a X-R inside...

The SVA/X+ can't be licensed from 3.2GHz to 7.5GHz. But the X-R can.