I’m quite tall, I wear heels when I answer the door but a lot of clients either want me to take them off cause I’m so tall or they just aren’t bothered about the shoes.
Only the odd few ask me to keep them on!
I also have a couple of really tall clients who I enjoy seeing and I don’t wear my shoes cause I like being quite a bit smaller than them
and they’re not fussed!
So my point is, I doubt most of them will be that bothered. You could always briefly explain as they come in that you normally wear them and why you’re not, light conversation/breaking the ice a bit I suppose