*SOFTBANK DEAL WOULD VALUE SWISS REINSURER AT UP TO $39 BILLION *SOFTBANK DEAL WOULD VALUE SWISS REINSURER AT UP TO $39 BILLION *SOFTBANK IS SAID TO PLAN 100-105 CHF/SHR OFFER FOR 25% STAKE *SOFTBANK IS SAID TO PLAN 100-105 CHF/SHR OFFER FOR 25% STAKE