here is a suggestion for reversal of bellows on the morris tune,shepherd hey,key g major adderbury version.
first bar,four quavers b c db,in same direction,reverse for next crotchet c natural,play next crotchet c nat in same direction.next bar,reverse direction for four quavers bcdb,reverse for next note A which lasts two beats,REVERSEat beginning of next bar,play four quavers bcdb in the same direction,REVERSEfor c natural,reverse for next two quavers b c,reverse for final bar,play all three same notes.in the same direction,or reverse on last note.
second part.reverse for lead in note a,reverse for b g in the next bar,reverse for c natural note worth two beats.reverse for next barplay b g[crotchets]reverse for A worth two beats.
reverse for next bar,play first two crotchets b d,in same direction,reverse for c crotchet,reverse for two quavers bc,reverse for next bar play this bar d crotchet low d crotchet, crotchet g in the same direction,or possibly change on the last note.
this is pretty similiar to how an anglo player would play it up the g row,they would reverse a little more on bc quavers.
for morris dancing,copying the bellow reversalsof the anglo concertina[to some extent]is going to suit morris tunes.