Hey Nick,
It sounds similar to a situation I was in, a team of maybe 15 software developers, 3 testers, 1 designer and 1 front-end guy(me). In my case it was clear that the company and leaders valued the software side of things far more than the design/ux side and it made it difficult for me to maintain things to a standard that I wanted.
The advice you’ve offered is good, I found it important to increase the knowledge of the rest of the team about front-end tech and to value design considerations more. It’s a challenge but if you’re working in the area you’re passionate about with respect from the team it’s not a bad place to be.
Cheers,