Swapping to shorter cranks SRAM Rival AXS

Hi,

I currently have 165mm cranks on my TT bike with this specific Rival crankset: https://www.cjperformancecycles.com/components/gears-drivetrain/sram-rival-axs-d1-dub-crankset-in-black__142526?currency=GBP&chosenAttribute=CW8614006#miv-1

It seems to me that the current crank is integrated into the spider with that plastic overlay, then bolted on. I want <160mm cranks which don't exist in SRAM Rival, only in Red/Force and even then don't come with a spider.

If I am correct:

- I need a standalone spider e.g. this https://www.bike-components.de/en/SRAM/Spider-for-Red-Force-D1-p223544/?o=1001016069-universal-none&delivery_country=GB&channeltype=pmax

- I then need to find some compatible cranks - found some by Leese on AE which are compatible with the BB etc. that come as short as 150mm.

Have I got that right? I can't do a straight crank-only swap due to the way this crank is built? Thanks.