I had the very issue when I recently purchase a lathe from ebay that came with numerous accessories. I have no real wall space as I have wall cupboards on most of the wall. I took the decision to make a portable rack, that would basically act like the wall, and provide me plenty of space to hang...
To be clear chucks/backplates I discuss above are cut with a left and right hand thread (in same part) so can be used both on the inboard and outboard.
As this is getting a less used thread not many inserts/ exerts are around the only one I know of is an exert that goes from female 1 1/2" to...
You can get chucks/backplates that fit the 1 1/2" x 6 tpi tread of the Graduate. Some have a left/right thread so it can be used inboard and outboard. Left Thread is on outboard side, Right thread on inboard size.
Axminster do a 1 1/2" x 6 tpi Left/Right thread for SK114, but not the smaller...
The last two backplates on the page are just plain bores that you could get machined to correct thread.
Or if you can find one you could use an insert to go from your thread to a more common size, but this is not ideal as it introduces additional tolerances, but is doable.
The Chuck you have I believe is an Axminster Super Precision Chuck, you can still get backplates that fit them from Beaufortink below.
https://www.beaufortink.co.uk/toolpost-versachuck-wood-lathe-chucks/versachuck-wood-lathe-chuck-threaded-backplates
If you are thinking you might need a chuck...
Yes I realise that thats why I suggested those live centres as they both have a 3/4" x 16tpi thread on them to allow him to make an attachement.
I use the one in the first link myself to make new attachments on 3/4"x16 nuts, so I know it works.
https://www.axminstertools.com/axminster-multi-head-centre-with-3-tips-1mt-340185
https://www.axminstertools.com/axminster-evolution-live-revolving-centre-1mt-504663
The two live centres above
from Axminster both have 3/4" x 16 threads, so you could get one of these in the UK, and if you live...
Sorry, thats all the paperworks thats in the box, not that helpful. Not sure what you are really after as the chuck operates the same as anything else I have?