Adding on to the previous recommendations...
En Reve is a good option.
It could also be fruitful to look through this video. It's a lot of lesser known Liszt. Some of the pieces are very difficult, some are not at all and will be manageable for him. There are some good options there.
Here's the track listings, and whether I think they will be manageable for him in my limited knowledge.
00:00 - Alleluja, S.183/1 (1862) Not manageable.
03:40 - Ave Maria (d'Arcadelt) (1862) Probably manageable.
07:40 - Klavierstuck in E Major, S.192/1 (1865) Manageable.
10:04 - Klavierstuck in A flat Major, S.192/2 (1865) Probably manageable.
12:12 - Klavierstuck in F sharp Major, S.192/3 (1873) Manageable.
13:30 - Klavierstuck in F sharp Major, S.192/4 (1876) Manageable.
15:18 - RW: Venezia, S.201 (1883) Maybe manageable.
16:42 - Recueillement, S.204 (1877) Probably manageable.
19:12 - La cloche sonne, S.238 (1850?) Manageable.
21:02 - Hussitenlied, S.234 (1840) Not manageable.
27:49 - Vive Henry IV, S.239 (1870-80?) Probably not manageable.
29:18 *pause*
29:33 - Unstern: Sinistre, Disastro, S.208 (after 1880) Probably not manageable.
32:37 - Dem Andeken Petofis, S.195 (1877) Probably not manageable.
35:47 - Abschied. Russisches Volkslied, S.251 (1885) Probably manageable.
37:46 - Bénédiction et Serment de Benvenuto Cellini, S.396 (1852) Not manageable.
44:04 - Die Rose aus Zemire und Azor, S.571 [by Spohr] (1876) I don't think he wants to play a transcription?
48:15 - Die Rose [by Schubert], S.556/2 (1838) See above.
52:54 - Drei Stücke aus der heilige Elisabeth, S.498a - 1. Orchestral introduction (1857-62) Not manageable.