"Someone to You" Brass Band Arrangement

Project

I need a complete arrangement of "Someone to You" by BANNERS for a Swiss carnival brass band ("Guggenmusik").

Reference recording: https://www.youtube.com/watch?v=XeLaiL9tk68
Guggenmusik is a Swiss/South-German carnival street-brass style: loud, driving, played outdoors from memory while marching. Straight groove, strong downbeats, off-beats in the inner voices, trombone glissandi, clear tutti stops.

The six parts: Trumpet 1 (Bb) · Trumpet 2 (Bb) · Trombone 1 · Trombone 2 · Tenor horn (Bb) · Sousaphone (Bb)

My two requirements

Trumpets and trombones should trade the melody back and forth. Both sections should have their moments leading — don't give the melody to the trumpets for the whole piece. How you divide it is up to you.
The tenor horns get a solo passage. A short exposed section where they carry the music largely on their own. Place it wherever it works best musically — I'd expect it somewhere in the second half, with a big full-band finish afterwards.

Everything else is your call. I'd rather hear your musical ideas than have you follow a plan of mine.

Practical constraints (amateur band)

Recognisable hook within the first 8 bars — consider starting with the chorus rather than the original intro.
Total length 2:30–3:00. Shorten or repeat sections of the original as needed.
Trumpet 1: not above written G5/A5. Trumpet 2 stays below.
Sousaphone: mainly roots and fifths, half and quarter notes. Between written C4 and C5, never above written G5.
No long rests other than around the tenor horn passage. The band plays from memory while marching, so anyone who stops playing for a while needs an audible cue to come back in — a percussion figure or bass pickup.

Key

Please write in Bb major (concert pitch). This puts the sousaphone root on Bb1 (written C4), which is comfortable and projects well outdoors. If you strongly recommend a different key, say so in your bid with a reason.

Notation

Trumpet 1 & 2: Bb, treble clef
Trombone 1 & 2: both versions required — Bb treble clef (transposed, read like a trumpet) and C bass clef (concert pitch). Same music, separate PDFs.
Tenor horn: Bb, treble clef
Sousaphone: Bb, treble clef (sounding two octaves and a major second below written pitch). Additionally as C bass clef.
Score: rehearsal marks and a one-line percussion cue staff throughout.