At your risk. Take all safety precautions.
The best method is possibly your method.
A drive unit cone can be of large mass. On the Pleiades linoleum Auratone 5C type monitoring speaker there is a bit of change of front side angle by weight. Mabe a good thing as deliberate lack of symmetry is important in acoustics.
Larger triagular pyramid enclosures may be more sensitive.
Ways round this may be the use of internal reinforcements, such as:
Small round white backside A4 paper binders which have a crossection similar to airplane wing.
Reinforcements may of bent stripes of linoleum.
Welding rods.
A metal wire structure as suggested by Vicky.
Or using an internal support for the heavy magnet between magnet and base of pyramid or other shape enclosure.
Etc
All the above should be possible to be glued by thermal glue, PVA, melted welding rod etc.
But it should be best if size is such that reinforcement is not needed, or using a more efficient lighter magnet speaker such as a neodymium magnet speaker.
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