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I'm currently in the process of painting a LR Redeemer/Crusader and I'm constantly struggling to keep the model clean from my dirty, grimy, paint covered hands.
it starts with priming when I run into the problem of having to handle the model to turn it, extends into the basecoating phase and ends, most infuriating, when painting details. A fingerprint of Leadbelcher on Ushabti Bone is often followed by a serenade of vulgar speech. Granted, in the meantime I get used to varnishing the model after a step so I can rub it off... Sometimes I only see it minutes after, so the paint needs some scrubbin' to get off and still sometimes damages the basecoat I so lovingly highlighted with an airbrush, so it is something I want to avoid if possible.
Smaller miniaturs and infantry isn't the big problem - kork and blue tac do most of the work for me there.
But with larger stuff I have yet to find a way to do this.

My current plan is to glue some bigger magnets (6mm or the likes) to the bottom side of the miniature. Then, using a T-shaped piece of metal as a handle, I can hold it without ever having to touch it anymore. Afterwards, I can break of the magnets and reuse them - with some damage to the bottom plate. But honestly, who turns around your Land Raider and looks at the BOTTOM of it?

I've never run into this problem, honestly. Painting the treads? Hold it by the hull. Painting the hull? Hold it by the treads. Weapons, gunners, etc. get painted separately, so they're no different than your smaller models. I also prime large models in stages (e.g. spray top, let dry, flip over to spray bottom), so manipulation isn't much of an issue.

Where is this errant finger-borne paint coming from? Other parts of the model? Opening up paint pots? In the former case, I'd advise slowing down, a tad. An extra minute or two, here and there, is all it takes for acrylics to go from wet to dry (not fully cured, of course, but unable to hitch a ride on a stray finger). In the latter case, it's still just a matter of slowing down and becoming more aware, either as a direct result of the reduced speed or a conscious effort. Painting from a palette, instead of directly from pots (if you don't, already) tends to help, as it limits your contact with the often messy containers. Just load up your palette, wipe any spills from your hands on a bit of paper towel, and you needn't touch paint again with anything but your brush.

I also like to wear a glove on my model-holding hand, if a lot of direct manipulation is necessary. It won't stop paint transfer, but it helps keep sweat, skin oils, etc. out of the equation. A box of latex gloves and a bit of patience is a lot less complicated (and likely awkward to use, especially for something as large as a LR) than a magnetized handle. No potential damage to the model to touch up or try to ignore, either.

Um, yeah, why are your hands dirty? Most large models I simply hold even if airbrushing.

well.. erh... I.... hum.
Sometimes I overthink a problem and am not seeing the obvious.
While I can't tell for certain where the erroneous paint comes from, I'm usually not stupid enough to finger the part I just painted
So I guess you are right with the paint coming from the citadel pots. If only I had a local vendor with Vallejo less than 100km away...

I'd simply drill a hole and gule in some pinning rod. Leaving a nice handle to work with.
Easy to snip off when not needed.
Or simply use blu-tack to temporarily fix a component to a wine cork. Should eliminate those stray fingerprints..

Yeah, that works with some small-ish things and/or infantry.
I even gotmyself some "black tac" that is sold here that supposedly holds up to 3kg... But that stuff grows "stale" somewhat quickly and ain't very cheap.
The "take care, wipe and slow down" approach is probably the best