PushOk SVN Proxy and SSH with PuTTY - possible solution

I've seen many discussions about how to use the PushOk Proxies with SSH,
and I've seen some generally bad advice.

Namely, setting an environment variable for the SVN_SSH setting. Everyone
seems to want to make it work with some form of funky escaping - the most
common of which is:

SVN_SSH="C:\Program Files\\Putty\\plink.exe"

Rather then adding an environment variable, the best practice is to modify
the SVN config file or registry, located in either of the following
locations:
1. %ALLUSERPROFILE%\Application Data\Subversion\config the [tunnels]
section.
2. %USERPROFILE%\Application Data\Subversion\config the [tunnels] section.
3. [HKEY_CURRENT_USER\Software\Tigris.org\Subversion\Config\tunnels]

The setting should use forward slashes rather than the munged backward
slashes, like so:

FOR PuTTY ONLY:
ssh = $SVN_SSH "C:/Program Files/PuTTY/plink.exe"
FOR ToroisSVN Users:
ssh = $SVN_SSH "C:/Program Files/TortoiseSVN/bin/TortoisePlink.exe"