I don't know what type of blackberry bushes these are but the following are plants native to the PNW region that can be used to replace invasive blackberry bushes:

- Sword Fern (Polystichum munitum)

- Red Osier Dogwood (Cornus sericea) has red stems that provide winter interest and clusters of white flowers and berries that attract wildlife)

- Snowberry (Symphoricarpos albus) produces small white berries that persist into the winter, making it visually attractive)

- Ocean Spray (Holodiscus discolor): It produces clusters of creamy white flowers that are visually appealing, especially when in bloom.

- Salal (Gaultheria shallon): Salal is visually attractive, with glossy evergreen leaves and clusters of pinkish-white flowers that develop into dark berries.

- Oregon Grape (Mahonia spp.): It features attractive evergreen foliage and clusters of yellow flowers that mature into blue berries.

I'm currently really into biodiversity and conservation and stuff, so I went nerd mode with ChatGPT