I reluctantly caved and turned IB on yesterday @Annette33, and found I had to set my guard low (not clicking the gov't ID and host recommendation options) in order to be seen by anyone new to the site. (I spend some time checking. I am in Canada, if that makes a difference, and it sounds like it does.) Most of my bookings are by first-timers, so it was all or nothing. I am sitting in dark dread, but so far so good. I really like the pre-booking message IB gives hosts. I know that it is prominent, because I just booked an IB listing as a guest. The limit on character count is great - keeps it short and to the point, but enough room to be both firm and friendly. No downsides to that pre-booking message. All good.
Like you, I was also afraid that once IB was on I could never turn it off, but a trial yesterday showed that wasn't so. For yesterday, anyway...
I will try to remember to update here if anything unexpected happens, because I understand where you are coming from on this.
Best of luck.