I think it would be great if it would be possible to see all equipped weapons at all time. All it would take would be alternative carrying-positions for weapons. For example if the first weapon is 2H and your secondarys are 1H there is no problem in showing both. If your second is 2H too, you could wear the two weapons crossed over your back.
If both, your primary and your secondary weapons are 1H, you could wear one set on your hips and the other on your back (wearing 1H weapons on your back is a mayor request anyway). I know it’s really just a cosmetically thing but i also think it’s not quite that hard to realise.