There were a number of posts on gearbox overhaul :
Transmission repair - 986 Forum - for Porsche Boxster Owners and Others
There are several follow up posts that you could find in "Search" that may help you.
To prevent the bearings failing again do you plan to add a cooler? That has been covered also.
You are obviously a whiz at sourcing ,so you could do a diy version of this:?
TRS Transmission Oil Cooler Kit | TuneRS Motorsports | Online Shop
These guys also sell useful clips:
TRS Shift Cable Security Clips for 986/996
There are also two gizmos to prevent 2nd gear pop-out. One by CMS and one by gbox:
2ND GEAR POP-OUT UPGRADE-GBOX Transmission
Then there is the Numeric shifter & shifter cable upgrade :
Quality Racing Products
Yes, you can spend a fortune on this gearbox! So it will be interesting to read what you decide is worthwhile.