What’s a hobok? I only found out that it’s a Ukrainian dance:-).
Anyway, I play the Vib. a little like you do, with its bottom resting on my left thigh (I guess this is easier for me than it would be for you because I seem to be taller than you are). This is great when playing without the trumpet mouthpiece, but when playing WITH the trumpet mouthpiece, the S-pipe becomes too large, so I have to hold the instrument in an awkward angle.
And that’s why I think your newly designed pipe is a big improvement because of the much better handling.