Slow Loris: Quick ? about cap, transistor, and diode substitution

[ChRa]

Hi, I'm building a Slow Loris Rat and short on a couple of parts. Need to know:
1. Can I substitute a: 2n5458, MPF102, or J201 for the 2n5457 transistor in the output buffer?
2. I'm out of 22n caps. Can I substitute a different value like 27n or will that mess with the tone. I like the Rat tone so don't want to change too much. Per the instructions: "C12 is a coupling cap between the tone and output buffer section. It also forms a very low HP
filter with the R8 resistor"

Separate question:
3. Clipping diode section. To get asymmetric clipping, I assume I'd wire one diode normal and two in series across the companion pads, right? Does it matter which pads (i.e., orientation of the diodes) I go with?

[Zigcat]

2n5458 is actually what the original used and lists on the schematic, so yes.

27nf will probably work just fine. Actually probably can't tell a difference.

[Zigcat]

Third part: yes, the diode position matters. One way makes the top of the signal asymmetric, flipped affects the bottom. This would be the normal application. The doubled with the anodes going into the output.

[ChRa]

Thanks @zigcat this is super helpful!