What's an alternative remedy for a patient with kidney failure aside from dialysis and kidney transplant?

Not much/depends.: Apart from dialysis and kidney transplant, there is not much that can be done for a patient with kidney failure. If acute, things like high dose glucocorticoids and cytotoxic agents like cyclophosphamide, plasmapheresis, and plasma exchange can be useful. Otherwise, crrt or continuous renal replacement therapy is an alternative to forms of dialysis.

Not remedy - death: Some patients with kidney failure who are not actively depressed, have tried dialysis and are not reasonable transplant candidates choose to withdraw from care and knowingly accept that they will die. This is allowed in the us but certainly not encouraged. A pulitzer prize winning author, james michener, decided after the age of 90 that he had written his last book and did withdraw from dialysis.