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If the foam rubber is failing, you may be beating a dead horse.
The head liners in old cars were held up by bows across the roof. In fancy models and convertibles, the bows were applied below the headliner and were chromed.
Perhaps you can find some material that you can make into bows.
Thin pieces of plastic trim found at lumber stores.
Check this out - https://www.amazon.com/RICWINA-Automotive-Headliner-Flannelette-Installation/dp/B082X2TBVH/ref=asc_df_B082X2TBVH/?tag=hyprod-20&linkCode=df0&hvadid=416895641179&hvpos=&hvnetw=g&hvrand=12043201361895797267&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001884&hvtargid=pla-885616468702&psc=1&mcid=c42efcd9a9fd300d9a1d01f0bcb8cb00&tag=&ref=&adgrpid=95673152084&hvpone=&hvptwo=&hvadid=416895641179&hvpos=&hvnetw=g&hvrand=12043201361895797267&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9001884&hvtargid=pla-885616468702&gclid=EAIaIQobChMIr5SAzaGhhAMVR2VHAR1sWQGdEAQYBCABEgK9HfD_BwE
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