Thirdly in our experience the SPUs give a great value for money
plus they are outstanding in playing old analog recordings.
Could you explain why do you think the elliptical profile is outstanding in playing old records? Those used records have been used in decades in the 50s/60s with conical and later in the 70swith elliptical stylus. Then you track them again with the same type of styli, do you think it’s a good idea? What is the benefit of this generic profile paired with low compliance SPU (with roller off frequency) for those wonderful old records? The Line Contact styli not only sounds better, but they are extract the information from the groove walls previously untouched by the conical/elliptical profiles! For vintage vinyl Shibata (or any Line Contact) is the best profile, but not the elliptical. Was it your friend or you (persionally) who compared the different SPU? My opinion is completely different from what you said, the Royal is superiour even compared to SPU Spirit Ltd and definitely superiour to classic elliptical SPU.
I found the conical/elliptical classic SPU not involving at all and the cartridge (another low compliance) which is much better in everything compared to them is the Fidelity-Research FR-7f.