Hi. We're going through the phase of starting living aboard

We bought (with my husband) 25ft Marcon Tomahawk, which seems to be very spacious for the length. Generally feels reasonably comfortable for two, but there are few tune-ups we need to sort out. Main problem seems to be a
shower. As a
emergency shower we use garden pressure sprayer which we can use in the self draining
cockpit with tent. It's good as an
emergency, but we need to sort out something permanent, inside the
cabin to be able to use it for example - during the
winter (UK). Have you come across any reasonable solutions for small
boats?
I think fitting proper shower in the heads area may not be doable - it would block the entrance to the fore-cabin.