In reply to bigrob:
When I did Alphubel, I caught the “sunrise” lift which only runs once a week (see time table below). I then traversed over Feechopf from Feejoch to Alphubel and descended to Langflue. A detour up and down Allalinhorn from Feejoch would add maybe 1-1.5hrs. I reckon the “sunrise” lift is going to see you at the top of Allalinhorn earlier and with more energy than coming up from Britannia hut would.
I found the glacier descent to Langflue quite sketchy and in hindsight wished I’d returned back over Feechopt to the Mitelallalin lift from where I’d started. This would have required out flanking a steep ice section on Alphubel which was ok in ascent but might have been sketchy in reverse. Conditions may be completely different for you. Maybe the route down to Langflue is in good shape, you’d need to check locally.
I’d suggest, get the “sunrise” lift up to Mitel Allalin and head over to Alphubel first via Feejoch and Feechopt. Return to Feejoch and if the timing of the last lift allows, do the short leg up and down to Allalinhorn summit. I believe the route between Mitelallalin and Felskinn is not good on foot so best not miss the last train.
Edit: Gosh, it’s 20 years ago I did this. Maybe more recent experience is called for…
Post edited at 23:00