Is there any reason I shouldn’t halve this recipe and just make one pie,

On the other hand, pie freezes beautifully. So if you'll have a need for the second pie in the next few months, make the whole recipe, eat from one pue now and freeze the other.

As far as halving a recipe goes this would be as easy as pie to do so.😉 I would if it were me making it.

I don't see any reason why you couldn't. You can also freeze an extra pumpkin pie, or just the filling portion, to use at a later date.

I think it would be really easy to halve. That’s what I would do, unless I needed two pumpkin pies.