You’ll probably be able to get away with fixing this almost completely for free (perhaps a small amount per month for high traffic sites with high form usage).
I’ve made a thread where people can post their solutions.
The tool I use requires my site to be hosted with them (netlify forms) but like others it’s been a simple case of just adding a basic line of text to the action field and perhaps 1 attribute to the form (from within the webflow editor). It takes me about 10 seconds and I do it as soon as I build the contact page so it’s done and forgotten.