Convert any Hipshot extender to have a 2nd setting e.g 1st lever tunes down to D, the 2nd tunes down to Db! These are £33+postage from bass direct. Price includes postage.
Popping this here in case any of you BB fans are interested. Seems like a good price but is out of my budget.
https://www.sellusyourguitar.co.uk/product-page/yamaha-bb-2004-natural-gloss-2005-electric-bass
The honeymoon period is over and I'm still very happy. I've swapped strings with the BB1024 so the BB1000 now has La Bella low tension flats which suits it perfectly for my playing style and sound, and have put the D'Addario rounds on the BB1024 for my slap needs...