So you would have to replace the 3 with 4 Gaias…or do you plan to put 4 Gaias under the base with the speaker on 3 cones? This sounds too adventurous!
I would replace the three cones with three Gaia threaded into the holes the spikes were in. Gaia are rated by set, if I had four holes I could go with the Gaia I, which are $600/4 (rated for 220 lb for four or 165 lb for three) versus $900/4 (I actually just found they are “on sale” at Amazon for $800) for the Titan Theis (rated for 320 lb for four or 240 lb for three). Just in case anyone asks, IsoAcoustics recommends the Titan Theis for my speaker. One more aside … I have thought of getting them next time I am at AXPONA, they offer show discounts (15% to 20%), but they keep postponing AXPONA. Oh well …
Then it’s important for you to know that the Gaias are flexible on their bottom part (between the metal parts above the sorbothane not on it), means they slightly tilt if on a single one and the speaker being pushed. You have to be even more careful than with one cone. Never touch your speaker again afterwards 
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I only have tried the GAIA footers and the level of improvement was stunning … best $600 tweak ever. Way better, for instance, than the (debatable) Ether Regen, for instance, or (I think I it sounds different, did you hear that thing?) a pricey cable upgrade. I gather it doesn’t have the same effect in every case, but there’s a money-back guarantee. My speakers are Gibbon Xs.
Try contacting partsconnexion
Do you have outriggers underneath the speakers? - or would the isolators be mounted directly underneath the chassis? If the latter is the case you could try the ISOPUCKS. Same technology as the Gaias but you cannot adjust the height. No problem if your floor is more or less level. Just tilt the speakers and put the ISOPUCKS below.
Due to the lack of height adjustment they are also considerably lower and your speakers do not look like they have been temporarily lifted, which is my biggest concern with the shiny Gaias.
The cones/feet are threaded into the bottom of the speakers. Using Iso Pucks is out of the question, way too much weight and the speakers would be too unstable for my liking.
Just get a huge guy in a Kilt like I do.
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I just picked up a set of the Herbie’s Titanium gliders for our Sopra 2’s. I think the lower frequencies are a good bit more resolved. I am not noticing much else.
Two things of note:
- Sitting in hardwood floors I feel less vibration in the floor.
- The gliders do glide. They make moving the speakers very easy. Of course it’s not like I am moving them very often. But fantastic for toeing etc…
Just an observation, Focal distributes ISOAcoustics in Canada and you’ll see Focal Sopra’s on Gaia’s at shows and in advertising. So they are believers in the synergy.
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I am a big fan of IsoAcoustics. I had GAIA under our Triton One.R and there’s Orea under most of our components. The Herbie’s were an attractive option since I don’t relish the idea of lying down the Sopra 2’s to deal with the glass base.
However, I have already purchased the Focal vanity cap that plug up the holes at the top of the base plate. To your point, Focal knows that customers are replacing their spikes with products like the GAIA, why else make the cap?
Fun fact: I could not find a source in the US or Canada who carries the vanity cap. Fortunately Analogue Seduction (a fantastic name!) in the UK has them in stock.
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