Sounds to me like an opportunity for a wonderful learning
experience, that you can easily "arrange" for!

Let this young fellow get started using the two lenses you have.
Certainly if the idea of making prints in a darkroom happens to
light his fires, to begin with he won't come even close to
noticing the deficiencies those lenses have.  Or, at least it
won't for quite some time.  (As a teenager 45 years ago it took
me 3-4 weeks to discover that a 50mm Vivitar enlarging lens was
a real limitation.)

Hence, if he only goes to all the trouble of making prints 3 or
4 times and then moves on to something that does interest him,
you don't need to invest in a better lense.  But if he's got the
enlarger cranked up at every opportunity...  set up a scenario
to /cause/ him to discover the limitations of those lenses.

First, get a couple more lenses!  One should be 75mm, and can be
another $1 special, because edge sharpness will not be
important.  But do spend $25-50 on a used example of one of
the better 50mm enlarging lenses.

Then propose a project to photograph something that will
demonstrate sharpness at the edges.  Try copying something that
is rectangular with important detail in the corner, such as a
page of text, a painting, or maybe best of all a line drawing of
some sort.  Then try to make an 8x10, or larger, print.

The lessons that follow from this will demonstrate the effects
on sharpness as the cheap lens is stopped down (not only is the
center a little sharper at f/8 or f/11, but due to a greater
depth of field the edges will be *greatly* improved)...  but it
will not be possible to get a print with sharp detail in the
corners (you can expect a thin line to be 1/4" wide!).

That's time to haul out a cheap 75mm lense!

The print won't use the edges of the 75mm lense... but to get an
8x10 requires a lot more distance between the lense and the
paper too.  Hmmm... it can be done, but is sure isn't
convenient!  (Might be time for a magnifier focusing aid, too.)

And that's the time to haul out the $30 example of a *good*
50mm lense!

A few experiments will show that when stopped down to the
sharpest f/stop, the edges are just as sharp on the print as is
the center, and a full sized 8x10 doesn't require wall mounting
the enlarger either!

For a very small investment, there's an awful lot of "eye
opener" that can be directly transfered to how the lense on a
camera works too.

In article <p3q0325oarujo32nbf26tmb0gotrs8h8la@4ax.com>,

No, they just make sharper prints over a wider range of magnifications
and over a larger range of optimal apertures. They also deliver better
color saturation in color and sharper lines in B&W.

But to get optimal results from any enlarging lens, regardless of the
quality of the lens you MUST print with a glass negative carrier and a
properly aligned enlarger.

  I also have a 50mm El-Rokkor, its an excellent lens. I
don't use it because I have a Componon-S in that focal
length. I am not certain what type of lens the Rokkor is, I
think a Heliar. Kodak Enlarging Ektars are also excellent
and often cheap used because they are so old.