I'm in the same boat you are! No real cold tone papers out there anymore since Kentmere Bromide was not manufactured anymore, and the US distribution of Slavich stopped. And certainly nothing compares to Brovira.
My only recommendation is to try Kentmere Fineprint VC. Its blacks are rich, and tone neutral to slightly cool. You might also try Ilford MGIV and subsequently tone it to obtain better blacks, but it's a far cry from Brovira. All these warm tone papers exist, but no great cold toned ones for those pure and deep blacks. Sad.