Wilkinson Sword Protector 3 - option for a lighter handle?

[asdfasdfggggaaaa]

I'm enjoying using a Protector 3 for travel, but the handle is relatively heavy (compared, say, to recent Mach 3 handles). Are there any lighter handles that fit the same cartridges?

 

[Sabre]

Yes, the original plastic handles from the 80's...