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So I’m wanting to convert my knight armigers a bit so they have actual hands with underslung or hand held weapons.

Does anyone know what models might have suitably sized power fists ?

Adeptus Titanicus Reavers?

Id completely forgotten about those models nice call

People don't use them too often so almost everyone has a spare or two.

You can get the upgrade sprue with a chainfist as well.

or you could try some Cryx warjack arms?
https://store.privateerpress.com/games/warmachine/models/inflictor-seether

bit too chaos for what I'm aiming for

If you're after claw like hands and have access to a 3D printer (or know someone who has one), there is a set over on Thingiverse.

https://www.thingiverse.com/thing:2799379

I think you should use something like Ogryn or orc hands. That would be a strong look.

1/144 scale gundam hands might also work.