Thanks for mentioning that thread to our friend in Iceland . I believe that is real good advice.
Building on that, I think it's worthwhile to contact Gordon and ask if he would be willing to make up a couple of pre-assembled recone kits ( that could then be installed by this user ) .
Two of his custom 2236's in individual 125 litre cabinets ( tuned for maximum woofing ) with the stock 2226's in individual 125 litre cabinets ( tuned for mid-bass slam ), would offer a really great HT experience.
If a custom 2236 turns out to not be a viable option, then our friend here may want to try his hand at making his own custom woofers.
Given his countries isolated situation, I feel the virtue of; "Necessity being the Mother of Invention"
acutely applies here.
McKenzie offers a pre-assembled 2226h recone kit
that could act as the base "mule" to build upon.
At a minimum ) the @ 97 grams mms figure would need to be raised to a bare minimum of 150 grams so that the driver can start to be act as a LF woofer/sub-woofer .
Adding weight can be done by adding an improvised ( non-ferrous, non-magnetic ) mass ring that is fixed/glued to the outside of the voice-coil former.
Another way to add weight is to paint the cone ( as JBL does with some woofers ) with a plasticized paint ( something like Duratex
( or a European equivalent ) would be a start. This is doable but finicky work requiring measuring capabilities.
Of course, the would be transducer designer will want a way to measure the ts parameters ( for maximum clarity of design ) by owning Dayton Audio's DAT v2
or for the financially challenged, a working TS test jig made to use with REW ( and a 2-channel external soundcard with an adjustable headphones output ) .