I almost put those up as an idea but I have no idea how they would do
compared to the stainless. If you do try them let us know how they work out.

JD

If you ever had an aluminum intake and seen how it is to remove the
thermostat housing bolts after several years, you know that aluminum and
steel don't mix.  They would probably seize faster than the plain bleeder
screws.  Plus aluminum is softer and more likely to break when you try to
remove them later.

The simplest solution is not to ignore the bleeders for 10 years. If you are
checking them and flushing the fluid every few years, you should be fine. If
you simply crack a bleeder each time to remove the tires for rotation or
changing or every year, you should be fine also.

Or do like Bob suggested. You can also buy some of the rubber nipples like
for blocking carb vacuum tubes and slip them over the bleeders with a bit of
grease.