Deploying QFEs

Hi,
Assuming that we do not plan to use Device Update agent,
is it advisable to follow the approach mentioned below
for deploying QFEs in field.

Approach
--------
1.Open QFE sld component using component designer
2.Find out the files being replaced and registry changes
required
3.Write a script which would accomplish the same on the
deployed image.

Is this approach advisable, is there any risks?

Thanks
Vrinda