just to be clear you are after a set of 100/135mm hubs, ideally with 6-bolt disc mountings, using conventional (9mm front, 10mm rear) axle sizes? You say '11s' but is that for a 'road width' or 'MTB width' 11s cassette? Confusingly shimano 11s MTB cassettes will normally fit on a 10s freehub body, but SRAM 11s cassettes will often only install on a 'road width' 11s freehub body, even if the bottom sprocket is 42T.
It is not clear (past you want 700C) what rims you are wanting (tyre widths?) or indeed whether you are likely to prioritise weight, cost, durability, serviceability, or something else.
FWIW I think that using spa cycles to build wheels to meet your needs is a good idea; I think you are more likely to be able to obtain a spare rim (at reasonable cost) in the event of a prang or a rim crack, and I also think that you will be able to choose an appropriate number of spokes for your use. Not that they should be, but if any wheel is built with standard DB Sapim or DT spokes, it is not at all difficult to obtain exactly matching spokes in the event that any are needed.
cheers