Soda media that ended up sitting on a neighbour's deck
was at the time blamed for some very bad brown staining, or so I read a year or two ago.
I do (so far) everything myself and full scale industrial blasting with grit and shot is something I did for a living once. Seen soda used on youtube, way slower than grit.
Suggest looking at vids to see for yourself how slow it is with professional equipment
and workers. Diy will be maybe 10 times slower and the worst drudgery imaginable.
Wouldn't even consider diy for my hull
even if there were no neighbours to sue me.
Maybe get some local opinion and think about barrier/tie coats?
A draw type scraper can work well for thick antifoul.