As far as I remember, you can define 31 (or 32 ?) BCCH. And that’s 64 one-way adjacencies.
IMO, one way adj can be “ho only”, “reselect only” or “ho and reselection”. It doesn’t matter. It is always counted as one. But… I’m not sure, sorry. Long time I worked with that, so I may have forgotten some tricks.
The only way to know for sure is to try it out… can’t you give it a try ? You’d know for sure 🙂