It is not as nice as installing with APT, it's more work to maintain, but you could grab the source and try to install it to your home directory. I've done that with other packages before.
You might be able to get the source via
apt-get source sks or else directly from the
sks project web site. However, looking at the code I don't see any obvious way to tell it to install in a particular part of the file system. The README file doesn't have that info and there is no INSTALL file.
There is also a development mailing list for SKS over at GNU Savannah:
https://savannah.nongnu.org/projects/sks/
It might be able to help you install SKS to a non-standard, unprivileged location in your account.
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