PDA Phone for Handwriting Recognition Calendar Function without Data Plan?

I currently have a basic family plan with ATT that is two years beyond the end of the two year contract we signed when we got our Sony Ericsson Z500a phones, so I have long been eligible for a phone upgrade. I also have an old Pocket PC (Win Mobile) PDA (a Cassiopeia EM500), which is a whole lot easier to use for maintaining a calendar than the phone's kepad organizer is, but too big to carry around in a purse with the big Sony phone too. I would like a phone with handwriting recogntion like my PDA, so that I could carry around one small device instead of two big ones. However, I wouldn't use a $30 data plan enough to justify paying that monthly fee. As I am a professor, I have a lot of appointments and really find it convenient to use handwriting recognition with the PDA calendar function and for drafting short Word docs; I also occasionally use wifi on campus with the free campus wifi server (my town offers free wifi too). Bottom line: I would like to get something like the ATT Pure but without the $30 data plan, since I have no wish to use my phone to surf the net, get email, etc., aside from that occasional use of wifi on campus or in town, where it is free. Having spent some time researching this on the internet and in this forum, I gather some other people would like a PDA phone without the data plan too--even if others can't always understand our reasons for this, which I hope I've clarified--but it is just not clear to me if there is any way to do that. Is there a way for me to buy a Windows Moble 6.x PDA phone ("unbranded" and/or "unlocked") on eBay or from AT&T at full price and keep my affordable family plan without a new data plan? Or is it just too easy to incur data charges even if one does not download music or tv shows, check email off campus, shop online, etc.? I would plan to transfer any software, etc, I want on the PDA phone via USB and a computer, as I do with my current PDA.