https://youtu.be/4dt3KDXiDUU
Finally confirmation you can do VSS in place.
It takes special tools and patience.
If you can change a starter on a modern BMW you could do VSS.
I didn't look up the cost of tools but I know for n62 you can rent them.
I'm betting less than $400 in total cost and plan a solid week of a couple hours a day or a very very long weekend of 10-12 hour days.
Keep your injectors clean they cost more than both turbos.