gavra_at_work: here are some of the people who learnt in Kelm (amongst many others..)
Reb Nosson Vachtfogel of Lakewood
Reb Yaakov Kaminetzky
Reb Elya Lopian
Reb Chazkel Levenstein Zecher tzadikim L’vrocho.
The OP also mentions the article about Reb Layzer Levin
If these are the Talmidim, they’re approach is the one I would believe is closer to the Kelmer approach. And there are honest books out there about them.