Pass Labs are a Company that embrace Tech’ as it becomes available that will offer new sonic.
The Company will reconfigure Topology and Circuit Design to exploit design changes. The swapping of a component only is not typical for a new product range.
Pass is not adverse to Circuit Board Tweaks, NP is active in the DIY community offering advisories on such matters.
There are a few DIY Phonostage Designs on DIY Audio that are known to punch well above their weight in relation to pricing.
I have been demo’d one SS Design with a BOM of approx’ £800 where it is commission built for less than £2K hold its own next to £10K retail.