Just like seat belt and air bags, more protection is better, IMO.
However, some might think that put a silicon diode in a tube power supply is a sin! If that’s the case, you can install soft start alone.
The soft start device is a CL-70 NTC thermistor in series between the fuse and the "hot" wire to power transformer primary winding. 10 seconds after power up, a time delay relay which connect to the power transformer 5V winding will turn on and bypass the thermistor. Both items are available on Amazon.com
Please bear in mind you also have a 3rd option:- capacitor mods.