David, do you have an issue with Suplex ? You appear to be trying your utmost to discourage anyone from fitting it
In fact their system is exactly what you are proposing to Neil, a different set of springs and dampers. It doesn't alter the geometry or the fundamental suspension design in any way.
Perhaps you are confusing it with the wishbone suspension offered by Mulfab which is another thing altogether.
Neil, I would go for it. It has really improved my roadster and, unless I've missed something, everyone on this forum who's actually fitted a system has posted positively.
I was out for a blast over some familiar North Yorkshire roads yesterday evening (3.7 Roadster)

Coming through fast bumpy corners the car doesn't get skittish and thrown off-line as before and hence it feels much safer.
The car still crashes, vibrates and rattles like no other but the ride is much improved - it's more supple - it's not soft.
The car is more satisfying to drive , the character is enhanced and the performance is more accessible.