private freebsd-update server - possible with -current?

[tech-lists]

Hi,

I'm not altogether sure which list this question should go to, so please
accept my apologies in advance if this is the wrong place to ask and direct me
elsewhere. 

What I'd like to do is to run a freebsd-update server for some low-power
boards that are tier2 or tier3 arches *and* for various attached hardware
reasons need to run -current (nodebug). I'd like to have the 
freebsd-update functionality missing from -current as it stands, so that a
full rebuild of the image isn't needed.

I read with interest
https://www.freebsd.org/doc/en/articles/freebsd-update-server
the article is old but the start of it says it was last updated recently
(2020-06-28), so still valid? so I'd like to ask the experts here:

1. would this be expected to work with -current? Looking through the page it
there's lots of use of patches that pertain to following releng. My use case
doesn't require that. [1]

2. will the server build/run under other arches? I'm interested in arm64 for
this. [1]

3. can it be made to cross-compile with native-xtools? [1]

ultimately what i'd like to have is a freebsd-update server on rpi4/arm64 
building for arm[6,7] arm64 and mips64. On the low power board, run
freebsd-update as usual, apply updates, reboot.

[1] right now I'm only asking if it's possible or if my idea is flawed, or if
theres a better idea.

thanks,
-- 
J.
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