Can't find a venue... St. Louis mo

My fiance and I are getting married next March in the St. Louis area and can't find a venue. He has social anxiety and so we are opting for a private wedding-- just us, my school aged kids (8 and 11 by the wedding), our witnesses, the officiant and a photographer.

I want a place that has a pretty backdrop (like you would find at the butterfly house, botanical gardens etc, heck Meramec Caverns even) but every place we try wants to treat it like a full blown wedding-- setup, tear down, seats for guests, 2 hours etc.

We just need like 30 minutes of privacy so we cam say our very simple vows. No prayers, no blessings or bible readings, no music, procession, no formal speech etc. Just a few minutes each to make our promises, a second to swap rings, kiss, sign the paperwork and leave.

Our problem is that wedding venues are sayomg that we need to pay for the whole wedding package even if we don't "need" it. I guess it is easy money for them. We can wleven be flexible of the time. Got a wedding at 4 and one at 8? Okay.... can we pop in and pay a few bucks to say pur vows whilst you wait for new party to arrive?the answer is a resounding NO.

Anyone have ideas on a place that would accommodate us? Most places won't even reapond to my inquiries...