You could try contacting Matt at High Country Roses as they used to sell Lilian Gibson and may be able to propagate one for you if they still have it in their gardens. It's worth a try.The alternative is to contact Peter Schneider at Freedom Gardens. It's in his Custom Propagation List which requires a $40 payment when the order is placed and requires 12-18 months before the plant is ready. https://www.combinedroselist.com/freedom-gardens.html Good luck.

Thank you so much for your response ! I had not heard of Freedom Gardens before. I will check out the sources you shared with me. My impression from the website is that they do not ship, but that rose orders can be picked up at Freedom Gardens when they are open. Do you know if that's accurate?

@Shalucie z5b you're welcome. No, I'm sorry, I don't know if they'll ship or not. You can contact him via the form on the site or call him at the listed phone number. If they don't ship, perhaps you can negotiate with someone here who lives close enough to pick them up and ship them to you?