Soaring in an Airplane (Katana DA-C1)

It seems that FAI sporting code section 3
definition 1.0.5 is very liberal in its
definition of a motor glider

"Motor glider - A fixed wing aerodyne equipped
with means of propulsion (MoP) capable
of sustaining soaring flight without thrust
from the means of propulsion"

So it seems that even a 737 can be considered
a motor glider if one can find enough lift
to provide "sustained soaring flight" without
the MoP.

Even more interesting, it seems that an ASEL
pilot (without a glider license and without a
self-launch endorsement) could get badges and
set records in something like a Katana
(14:1 glide, best glide around 70 knots).
Of course the lift would need to be quite
strong (I'm guessing min sink is 250-300 fpm)
but mtn wave is a likely candidate.

I once soared a Katana DA-C1 in Reno wave this way,
quite accidentally, with the engine at idle.
Hmmm...with an engine noise level GPS Volklogger,
perhaps I could stop the prop instead, and
use the DA-C1 to get an altitude part of a badge?

Can anyone see any reason a DA-C1 airplane could
not be used for soaring badges and records, assuming
the engine and prop were stopped? :-) Sure
beats three rope breaks on tow ;-)