hub conversion

should it be possible to go from 100mm x 12mm to 110mm x 20mm on a Hope Pro 4 hub using the Hope conversion kits?

it looks to me from the hope site that you can do one or the other but not both at the same time as in you can go 100×15 to 110×15 or you can go 110×15 to 110×20

Yes it can be done. In the days before boost the front hub standards were 100×15 or 110×20 and it is just an end cap swap between the two.

Do you mean 20×110 or 20×110 Boost?