Didn't HÄt produce some of their miniatures in 28 mm ?
Yes they did and I have some. Andalusian, Almoravid and so on.
They are horrible. Truly awful, combining as they do the appalling lack of detail of most 1/72nds (but in greater and lesser measure) while being even more fragile.
I have managed to use some of the shields on other figures. I used the heads in a creative fashion with a stand of prisoners buried in the sand and about to be trampled by an elephant.