Upvote:2
According to the Theravada Bhikkhu Patimokkha (quoted below), lay stewards of the monks or nuns should handle money, to my understanding.
If needed, exceptions or modifications to minor monastic rules can be made, based on The Great Standards. And not to forget "If it is desired, Ananda, the Sangha may, when I am gone, abolish the lesser and minor rules". (DN 16)
Rule 10: In case a king, a royal official, a brahman, or a householder sends a robe fund for the sake of a bhikkhu via a messenger, (saying,) "Having purchased a robe with this robe fund, clothe the bhikkhu named so-and-so with a robe": If the messenger, approaching the bhikkhu, should say, "This is a robe fund being delivered for the sake of the venerable one. May the venerable one accept this robe fund," then the bhikkhu is to tell the messenger: "We do not accept robe funds, my friend. We accept robes (robe-cloth) as are proper according to season."
If the messenger should say to the bhikkhu, "Does the venerable one have a steward?" then, bhikkhus, if the bhikkhu desires a robe, he may indicate a steward — either a monastery attendant or a lay follower — (saying,) "That, my friend, is the bhikkhus' steward."
If the messenger, having instructed the steward and going to the bhikkhu, should say, "I have instructed the steward the venerable one indicated. May the venerable one go (to him) and he will clothe you with a robe in season," then the bhikkhu, desiring a robe and approaching the steward, may prompt and remind him two or three times, "I have need of a robe." Should (the steward) produce the robe after being prompted and reminded two or three times, that is good. .....
Rule 18: Should any bhikkhu accept gold and silver, or have it accepted, or consent to its being deposited (near him), it is to be forfeited and confessed.
Rule 19: Should any bhikkhu engage in various types of monetary exchange, it (the income) is to be forfeited and confessed.
Rule 20: Should any bhikkhu engage in various types of trade, it (the article obtained) is to be forfeited and confessed.
(Bhikkhu Pāṭimokkha, translated by Ven. Thanissaro)