Not sure to be honest,
Looking at your 4 feed schedule (from Sept/Oct mums) his lunchtime isn't too much after you would have normally breastfed him, or you can maybe lunch at 11ish initially then gradually push it out to nearer 12 ish. I think it will be trial and error for a little while.
With solids I always give Calum sips of milk to wash his solids down with, just like we do as adults. You could maybe give water (Calum spits it back at me

) or a baby juice (not keen on them

) - although you probably already do this.
It like the Krypton Factor for babies, thats why I am not dropping a bottle yet, even though he plays with 12 and 4.30pm milk

HTH