Hi Raion,
I already have a FeeBSD Ports fork, as I semi regularly raise Bug reports to the FreeBSD team on one thing or another ;-)
Here is my fork:
https://github.com/zebity/freebsd-ports/tree/main
I have already cloned this down onto my Fuel and will start on IRIX-6.5 branch.
Or rather it is in the process of cloning, as doing stuff on old IRIX box is slow ;-)
As part of boot strap I just used SGUG-RSE git, but I will replace this with source build and hopefully make it so can bootstrap via SGI Freeware ....
EDIT: Elected to export IRIX disk with Port Git repo via NFS, as RSE git does not work with password token, that is mandatory with GitHub.
But I am gettting way way ahead of myself already.
NOTE: the reason I am not using SGUG-RSE beyond bootstrap is because it is a "binary" distribution mechanism and I just want to have a source based approach.
EDIT: see above RSE Git does not support http token auth.
On trimming FreeBSD Ports tree, I don't see the point, you can just ignore the stuff that you don't use, trimming is just extra work.
Anyhow approaching the brick wall fast and likely to have a crash soon.
As always thanks for going to trouble of keeping IRIX Network up and running.
Cheers from Oz,
jwhat/John (& zebity on github)