If you have a "The Range" you can pick one of these up for £5 or £9 delivered. I have used it with tea and it does work. https://www.therange.co.uk/tableware-and-dinnerware/teapots-and-cafetieres/cafetieres/the-original-coffee-co-cafetiere#534011
There's one near my parents place so good shout I'm off there next week, I'll see if they have any bargains.
I hadn't thought about using a French press but I think looking like a teapot would be preferable.
@Cazakstan started
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If you have a "The Range" you can pick one of these up for £5 or £9 delivered. I have used it with tea and it does work.
https://www.therange.co.uk/tableware-and-dinnerware/teapots-and-cafetieres/cafetieres/the-original-coffee-co-cafetiere#534011