Which blend circuit to pair with a fuzz?

[Snufkinoob]

I want to try adding a blend control to an fy-2 companion fuzz, but have come across three schematics. Is one more suitable than another to pair with a fuzz circuit? 

There's a mini, a split-blend, and this one

[blackieNYC]

Some pickups/fuzzes won't like the loading of the input and the send. And if you use an active splitter, the fuzz might not like that too much either. You could use an active splitter and precede the fuzz with a pickup simulator to give the fuzz's input the kind of source it likes to see.

[Snufkinoob]

I've seen a few fuzz pedals with a blend, (typically the two "shin ei" boxes as it happens) so I'm guessing that the potential input/phase issues from the blender don't apply to these circuits and a simple solution can be utilised.

This video is the kind of thing I'm aiming for, so I guess split n' blend is the right way to go even though I'd be wiring it up internally, and not as a separate box. Seems right. Anything obvious I'm not seeing?

[blackieNYC]

What you want could sound great.  It's just that there are fuzzes which won't want their input impedance lowered by a passive split, and won't like a buffered splitter.  The fuzz face perhaps, but not all fuzzes. Just do it on the breadboard first of course.