Hi Pierre,
The switches you mentioned will not work as SPDT failsafe switches that provide a low loss path from Tx to RFC when no DC power is applied. The SPDT failsafe switches we have are HMC546LP2 (0.2 - 2.7 GHz) and HMC646LP2 (0.1 - 2.1 GHz). We don't have any SPDT failsafe switches that works at 8GHz.
Best Regards,