rsvp follow-up for “yes” responses

We are sending invites out 10 weeks prior to the RSVP deadline, and 4.5 months prior to the wedding date. I know this is earlier than the recommended window of time, but we have SO many family members asking questions about who is invited and who isn’t, travel info, etc. that we feel like we needed to go ahead and send them out so people can get all of the information they need to plan in advance (give the people what they want!). However, I feel as if there will be some folks who RSVP “yes!” right away after receiving their invitation out of excitement and good intentions, but then either forget, lose excitement, or whatever between now and the wedding date and end up not coming. That is fine... unless we pay for a bunch of people who don’t notify us that they’ve changed their mind/don’t cancel their RSVP. My question is: would it be weird or totally fine to send something closer to the event along the lines of “still planning on coming?” but worded better, to get an accurate guest count. Just a little check-in. Thoughts? Has anyone sent follow-ups to their peeps?