While I understand your desire for more pipes (I'd go further than your request) why not first try to get the electronics usable? Even if you can get more pipes (and do try!) they won't be there tomorrow. A lot will depend on funds of course but if you could get the electronics made you could get them to secure more funds. New amps, speakers(*) and a bucket of nails might be a first start. Could also give you time to prove them you're worth the investment.
An other option would be to look out for a second hand pipe organ.
A Fourniture IV would be a four rank mixture.
(*) cones with a rotted surround or mice eaten cones would just give such a distorted rattling sound.