Minimum OS9 install for Oldworld and BootX?

[Dax Kelson]

I have a beige Mac G3.  It has a 4GB hard drive. It currently had Mac OS
9.0 on it (on the entire drive).

I don't care about Mac OS 9, I'm never going to use it, but apparently I
need it installed to boot Yellow Dog with BootX.

My questions:

What is the recommended way to install Mac OS 9 so that it is as small as
possible since I'm only going to use it for booting Yellow Dog?

Given my usage does it matter what version of Mac OS 9 I'm using (9.0,
9.1, 9.2)?

Dax
(I'm not subscribed yet, so please Cc me on responses)