the only problem is that there are no strings for these stringlengths. You’ll either have to accept the lower tension that you’ll get and a very thumpy sound or put together a set yourself, to get more tension and sustain.
Or get a hand made set for your bass.
On my bass right now I have a spiro low B tuned to C, spiro solo F# tuned to G, a normal spiro D, a spiro G tuned to A and the Passione high C tuned to E.
you get less sub bass and slightly less volume with a smaller instrument, but that’s not an issue for me.
The Passione high C must have a lot more tension than your other strings on your instrument.
The tension for the high C at E on your instrument is 30% higher than intended on a 105 cm 3/4 at high C pitch.
Your Spiro G Mittel 4/4 at A on 95 cm: 28.2 kp
(If it is a 3/4 Mittel at A on 95 cm: 32.1 kp)
Your Passione high C at high E at 95 cm: 39.4 kp
My recommendations for a high E on your 1/4 scale instrument:
An NS Electric Traditional high C at high E on 95 cm: 30,34 kp
Pyramid Soloflex high C at high E on 95 cm: 32.37 kp
Almost any other string that is still available is above that.
Or it has a synthetic core like Super Sensitive Sensicore (aluminium wound, I broke one when tuning up four halftones on a 110 cm scale): 24.4 kp (High E on 95 cm, still 130% there)
The NS EUB string (the Traditional is a shorter version of a Helicore Orchestral) would be my favorite. I hope it would fit the shorter scale up to the nut.
The Pyramid is a special order. Directly at the factory in Germany. Not too expensive. Core is a 4-strand braided steel core made from solid steel wires, so a bit bright sounding.
The Sensicore sounded weak to me. I tuned it higher to try if if sounds better up there, but at a major third up on my 110 cm scale which is almost the same as a fourth up on a standard 105 cm scale the string broke. It might hold on your instrument as a high E but there is still a much higher risk of breaking.
All this was calculated with my public tools, the “recalculation …” Excel file, Formulas.html from my Dropbox and a few of my own tension measurements for the Spiro Weich high C (special order from Thomastik, they don’t specify if for 4/4 or 3/4 but does fit the 3/4 set better) and the Pyramid Soloflex high C.