Re Rigging a schooner with SS7x7 Nicopress

[Brion Toss]

Hello,
Terminals are tools, and you use different ones for different jobs. But first, let's correct the assumption that, because this is not a Marconi rig, the loads are lower. Depending on relative angle, number and strength of shrouds, and vessel stability, they might actually be higher on any or all wires, than on a comparable-size Marconi rig. So, as always, see about running the stability numbers.
Next, the soft eyes are the tricky bit; I've seen a few rigs done with nicopressed soft eyes, and too many of them had broken yarns at the throat of the eyes, from the lateral loads there. You can reduce this by making the eyes longer, but if you do the trig I think you'll see that you will need ridiculously long eyes to reduce the lateral load much.
Nicopresses can work at the lower ends, but you will almost certainly need to get this done at a commercial shop, assuming 3/8" is the correct size for any/all of these wires.
Nicopresses are corrosion-vulnerable, and, in my experience, are more likely to trap water (crevice corrosion) than swages. They'd be a good, cost-effective terminal at least for the lower ends, but wouldn't be likely to last as long as your splices did (38 years, wow, that is probably pushing things severely; what climate was this in?) Consider having someone else splice those upper ends. Either that, or convert to tangs, if that is possible.
Fair leads,
Brion Toss