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Patreon
I researched a lot of the providers, and Patreon would've worked for us... but, it really only works for a single person.
Open Collective is by far the better option here, it allows multiple people to be on the account and to let different people pay different bills and still be reimbursed and have it done transparently.
There is only a single reason I didn't do Open Collective sooner... you can't migrate subscriptions from PayPal.
But I will cancel all subscriptions, so if this group has their stuff together and are committed to continuing to run LFGSS (and a few of the other sites like Espruino or PignoleFixe)... then start over afresh on OpenCollective whilst you have the goodwill and enthusiasm of people to get the place into a good state, and whilst it has the extreme transparency of showing how it all adds up.
This part makes me consider the value of adding Patreon as an option. Because (a) they'll do the chasing bit for you if someone's card expires, and (b) it's an easy option to include for people that already subscribe to support various other ventures.
It might not be the most efficient option financially, but its popularity is a strength which could reduce the barrier to entry enough to offset that.