There are a couple of answers to the insurance question
for Sparrowhawk like gliders and towplanes.

The simplest might be just to register as an Experimental,
in which case the problems just disappear.

Further, the Recreational Aircraft rule has not died;
it is very much alive, but under some delay. AOPA
has withdrawn it for some more work on it, according
to an FSDO presentation on it at the Wings Program
two nights ago.

His opinion there is that this new rule will change
lots of things in the industry and offer lots of ways
for people to make money.
If the projections for growth in this market are 50%
attainable, the insurance companies will take notice
and will very likely write new kinds of policies to
take advantage of it.