Hello, Salsa has a repository with initial packaging of txi2p [1]. It seems that txi2p did not have Python3 support until recently [2], and to date there is no stable release providing that. So only viable option for now would be to package git head.
[1] https://salsa.debian.org/pkg-privacy-team/txi2p [2] https://github.com/str4d/txi2p/issues/10 Andrius