Receiving line - when to do it

Hi all,

We are getting married in April this year.

1pm church wedding (service approx 40mins). Then 3pm at the reception venue (20mins drive away from the church).
I had wanted to do a confetti photograph on the church steps, hence why allowed over an hour between the ceremony ending and the reception beginning.
But I now think that's a mistake as we could probably have done the arrival at the venue from 2.30.
Our venue says we don't really have the time for a receiving line before dinner.
3pm canapes4pm sit for dinner 4.15pm serve dinner. 6.30pm speeches7.30pm evening guests arrive
So, I'm now thinking that maybe we could do the receiving line at the church, as people leave and make their way to the venue. Though, this does rule out the confetti throwing, because I can't ask people to stand aimlessly on the church grounds for up to 30mins waiting for the receiving line to end. We have 90 or so guests not in the wedding party, that we'd need to greet. So if you are first out of the church you'd have the longest wait on the church front garden.
And we aren't serving drinks until people arrive at the venue.
It's all confusing me now and I'm not sure what's best to do!
Any help would be appreciated. And please don't say don't so a receiving line. We have guests coming from far and wide and I'd like to see their faces early in the day. I've been to weddings recently where I've not seen the bride or groom until saying goodbye. 😬
Thank you ❤️