Quote Originally Posted by gmvgmvgmv View Post

Might it be possible to combine 5800 cogs with a Shimano 6800 14-28, replacing the inboard 6800 cogs with the largest ones from the 5800, giving me the desired 14-32t configuration?

If this is not possible due to groupset incompatibilities, would a combination build of two 6800s, a 14-28 and an 11-32 give the desired gear range and be compatible with the Synapse Shimano 105 groupset?

Thanks for any assistance or suggestions!
Yes, just buy the junior 14-28, and combine them.