For filtration I generally use either submersed power filters, or canisters.
For tanks only partially-filled there is less filtration demand because of the lower total water volume. The emersed plants really do help with nitrate reduction and other water purification processes, so there is also less need for water changes relative to non-planted systems with comparable water volume and bioload. Canisters do require either plumbing through the tank floor, or pipe retrofit (easy to do) to reach down to lower water surface.
Now is a good time for shipping plants--before it gets much colder.
Thanks for the fish recommendation. A group of small-sized and active cories could be perfect for this new setup idea that I have.