Jerry,  An inexpensive and effective way to supply air to organ pipes
is to use a commercial playground inflatable blower -- the type used
to inflate those bounce houses, etc.  They come in various sizes, each
with more CFM [cubic feet per minute] output and higher pressure.

I'm am currently using a 1/2-hp Xpower blower which supplies plenty
of air at 7-1/2" water pressure for another instrument.  I am guessing
that the Reproduco organ pipes operate on 6" or less, so this size
would work.  You might even get by with the 1/4-hp model; just check
the static pressure.  The latter is not always listed, but if you write
to the vendor, they will provide it as well as the noise level.

Adding a regulator and/or reservoir would help steady the pressure and
give a better performance.  These units are quiet, but not as quiet as,
say, a Ventus organ blower.  About 55 dB noise level, as I recall, for
the 1/2-hp model.  But they only cost around $100 (a lot less than a
$3000 Ventus) and are readily available from places like eBay and
Amazon.  Here is a link to one of the distributors:

https://www.airchaser.com/home-equipment/blowers/inflatable-blowers/ 

Jim Quashnock