It seems to be a standard 1-1/8" lower headset with a regular 30mm crown race/baseplate. I think the "funnel" is just a styling thing and, as you surmised, designed to match the frame's headtube. As to removing/servicing the crown race in the future, there are two options:
1. Get a "knife edge" type crown race remover, basically a bearing splitter. Park makes a very expensive shop quality one but there are far less expensive designs available.
2. Buy a headset with a split crown race which can be installed and removed by hand. The Velo Orange "Gran Cru" headset is this type and a very high quality one.