I have fashioned up a bracket for a seat that is suspended of the rear of the rack, (from a Hamax mount)
This allows me to run the pad and stoker bars for my four year old. and the twins go in the hard seats.
You have to be very careful when trying to get off the bike as its pretty top heavy. BUT the boys love it.
@motorman….
The problem with the chain might be solved by a long cage mech, but i think it would still be close, as the chain gets ‘pulled’ up behind the chainring slightly when pedalling. It may well still rub on the stand.
i thought about running some kind of ‘anti’ chain tensioner (one that pulls it down instead of up), but in the end decided it was too much grief.
Not to mention the struggle it is to get the alfine cable clipped into the hub when its behind the running boards etc: tight.
Good luck anyhow!.