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I've not magnetised the models you are talking about specifically, but I've been doing some Sisters of Silence lately with equally tiny arms. I've found the best way to do it is with a magnet on one side and a pin in the other. The pin means the weapon can only be removed by pulling it straight out and you only need a tiny bit of magnetic force to make it really secure. Pictures hopefully communcate what i mean (should see a tiny pin on the left side of the image and there's a magnet in the wrist on the right side of the image):



I tend to use beading needles as pins because they are really thin and strong, and just a 1mm magnet in the other side.

If you are after miniature parts (looks like you are in the UK?), there's always ebay and a bunch of good bits resellers to get extra bodies and weapons:

https://www.bitsandkits.co.uk/ (site currently being rebuilt so not available until next week, but they have the biggest ranged by far)
https://www.bitzbox.co.uk/
https://www.forbiddengaming.co.uk/

Magnetising stuff like this definitely is fiddly and time consuming if you it want to look right. If you're not worried about buying/ building/ painting duplicates then it's probably just easier to do that.