Another option I don't think anyone mentioned is the Windrose A3 handle in 303 stainless from Razors and More on Etsy:
Windrose Safety razor Handles 9 designs to choose from. Made | Etsy - https://www.etsy.com/listing/487525990/windrose-safety-razor-handles-9-designs?ref=shop_home_feat_3&frs=1&variation0=621964557
Their A1 and Darwin are also hexagonal, but more expensive.
Windrose Safety razor Handles 9 designs to choose from. Made | Etsy - https://www.etsy.com/listing/487525990/windrose-safety-razor-handles-9-designs?ref=shop_home_feat_3&frs=1&variation0=621964557
Their A1 and Darwin are also hexagonal, but more expensive.