I was also not too happy using a sewing machine for blind hems, but was introduced to Madeira Monofil 60 which comes in clear or smoke and is so thin it is untrue. However the downside is finding it. The shop I bought this from has long gone, and other shops if they have any Monofil it is 40 which is much thicker and nowhere near as nice to use. Monofil 60 is like gossamer and can be washed up to a temperature of 95degrees, you can use an iron - recommended setting one dot, and can be dry cleaned.
This Monofil comes on a reel like Sylko used, and whilst it doesn't say how much is on the reel, it certainly goes a very long way.
Why not see if you can get a reel of the 60 and try this for yourself and see what you think, you might just be surprised.