It is not possible to book these reservations anywhere online. Please complain to SNCF Normandie about that. You can buy these reservations at an SNCF ticket office or at any SNCF ticket machine, also outside Normandie. Maybe also by phone. Press #85 for English. Thank you for letting me know, that makes sense now. It would be useful if interrail updated their website to explain this to save people hours of going round in circles on SNCF's website!
This train will not continue to Paris, according to SBB: sbb.ch advise to take the 17:10 IR if you're departing from Zürich HB. You should be able to book the TGV from Basel. It's quite expensive though; you can save 25€ by going to Mulhouse by regional train and taking a TGV from there. The problem is I would be arriving at Zurich at 17:20, otherwise the 17:10 would be perfect. It looks like I might have to stay the night at get a TGV the next morning then, unless there are any connections to Paris not using the 17:34
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