Could you make more detailed photos of the old type trangia adapter - burner cup style (photos with dimensions will be excellent). I would be very grateful. Best wishes.
It's available as a spare part from Trangia: https://shop.trangia.se/en/spare-parts/burner-cup-primus-system.html
Yes you are right. But delivery is only inside Sweden. Maybe someone will help buy and ship to Russia. I will pay for the goods and delivery.
There is also an adapter for MSR Whisperlite . MSR Whisperlite Adapter für Trangia bei outdoorbaehr.de online kaufen, 14,95 €
Trangia extras You can DIY a straightforward leg replacement for a Whisperlite by making 3 shorter "legs" that sit on the top of the Trangia stove support, and otherwise attach to the burner like the originals. Shaped to also catch underneath, you open them in the central hole to lock them in. I made mine from old bicycle spokes but sturdy wire of any sort would work.