In the past Newtone strings were willing to put sets together as I asked. www.newtonestrings.com. In the contacts bit there is an email option. I'm sure if you know the lengths and gauges of the strings you want they could supply.
Can we see some pics of the restoration? And a calliper will tell you what gauges came off of it so you can order those. I would also love a vid of you playing it too. Is that possible?
You might want to contact Gregg Miner
He is harp guitar central
The person to ask about strings these days is Muriel Anderson who has had at least a couple of these made for her...she's on FB.