I would wait and fit the Kleos to the current arm but do use antiskate, VPI are wrong about that. Lyra specify a VTF that aligns the coil optimally in the field of their magnet system but if the coil is displaced laterally by the wrong or no antiskate that’s a bit of a waste of time. The other problem is a VTF that varies as the arm swings in the vertical plane because when adjusted the centre of gravity is at a point below and in front of the pivot point.. If you measure VTF at anything but the height of the playing surface your measurement will be wrong. You will also find that VTF needs readjusting after changing VTA. So VTF as well as VTA will differ with record thickness, unless you have the micrometer tower and readjust for each record. I used to run a Naim Aro with a Transfiguration cartridge, another with ring magnets and set VTA and VTF by ear but used measurement to keeps track of changes, even though to get around 2.1g at the record my scales were reading 2.44g. There is a hand and sensitive spirit level that comes with an Aro and can be placed on the flat topped cup above the pivot to keep an eye on VTA and azimuth, the VPI has the armleads in the way. Some would resort to a USB microscope to set SRA directly, I’ve never tried. Your ears should be the final arbiter.
Where the unipivots tend to win out is eliminating the grain from the sound, if they don’t blow it by having low pressure metal to metal contact elsewhere in their design, like the Aro has with its standard counterweight but even there the effect is less than most gimbal arms. @mijostyn uses a Schröder CB which magnetically stabilises its bearing races and has a well damped armtube too. The 4point tries for a gimbal like bearing with high pressure point contacts and the Triplanar uses very high spec bearings to try to have the best of both worlds. The Well Tempered LTD is another attempt to address this and there are a couple of other string based designs, one of which I now use, and like mijostyn’s CB also from Schröder, in the form of his Reference arm.This uses a very strong magnet to keep a piece of string under high tension but the magnets are shaped to maintain a neutral balance effect.
Incidently @mijostyn I had a similar problem with my Schröder counterweight being too heavy for the Dynavector 17D3 I wanted to fit but found that the brass cartridge mounting plate option, which adds around 5g over the aluminium one, got round that. The effective mass of around 18g wasn’t a problem despite the compliance of the DV.