I use a turkey baster to suck up the fluid from the master cylinders before working on the brakes or clutch. Doesn't have to be sophisticated. :-)
Yeah, using a shop vac does not instill confidence and the education stuff I linked to (autoshop101) has some sort of tool that uses nitrogen when working on these things because they say introducing compressed air into a fuel is dangerous. I'm not sure why the older manuals talk about shop air purges but I guess in concept hooking 43 psi to a saturated fuel canister is a bit like a supercharged engine waiting for a spark.
'91 Toyota Pickup
'09 Kawasaki KLR650
'12 Gunnar Rockhound 29
“Anyone who believes in indefinite growth in anything physical, on a physically finite planet, is either mad or an economist.” -- Kenneth E. Boulding