sysupgrade: exclude sets

[Leo Unglaub]

Hi,
i am a huge fan of sysupgrade. It works perfectly on my laptop where i 
use all sets that OpenBSD provides. But now i want to start to use 
sysupgrade on a router where i don't need the "x*" sets.

I looked at the manual here (https://man.openbsd.org/sysupgrade) but did 
not find a way to exclude them (-x*) from the selection.

In this case i also cannot use an answer file from a DHCP server because 
i don't control the DHCP environment in that network. So that option 
falls flat for me. Is there a way to remove sets from the installation 
that i am missing?

Thanks so much!
Leo