Clear barrel flex nib pen?

I posted recently about re-finding my love for fountain pens. I am now the proud owner of a Lamy Safari Meteora (such a pretty purple!), and I bought some other pretty ink to put in my old giraffe fountain pen.

I can't find it. I am genuinely a little heartbroken, it was such a fun looking pen.

So, I've decided to treat myself. I am now looking for a flex nib (because if I'm going to have pretty ink, I want to be writing beautifully too!), and a clear barrel for two reasons. One, I want to show off my pretty ink. Two, I have a very talented artist friend who I'm going to ask to design a sticker to cover the barrel with a giraffe or two, similar to the TWSBI eco cherry blossom edition.

Currently my best guess is the TWSBI eco, but I don't think it has a flex nib, do you have any suggestions? My budget is up to £100, £200 absolute max (if I save up for another few months!). I'd prefer to be under £100 is possible, then I can pay my friend more!