Gavra, I would think the basic package at halls such as Torah V’yirah, and the takanah packages available at other halls, would be the template for a tzedakah subsidized chasunah. Generally, that’s a downgrade from what you described, but something which many non tzedakah chasunahs do.
One man band, regular chicken, ices and cake for dessert, etc., in a regular hall with waiter service. Number of guests would have to be flexible, based on family size.