@Suiseiseki Not really, most I2P torrent clients are specifically for I2P and don't really do any cross-seeding (this is seen as a feature by many, as it prevents misconfiguration accidents).
BiglyBT explicitly has a plugin for cross-seeding, but it's also almost entirely Java.
If you want something memory-unsafe that /could do/ cross-seeding (some assembly required) then libtorrent has been integrating I2P support and that's in C++.