There are lots of ways to contribute to open source projects like OpenBSD, though there's always a risk that helpful but tedious work is neglected. This seems both helpful and tedious, and thus I think it's a great idea.
The idea of contributing to OpenBSD is fine, but it would be wise to make friends with those in power first (perhaps especially Theo) before expending too much time and effort on coding.
Probably good to have humility and a thick skin also, and they welcome $ donations to their project, but I not necessarily with strings attached or orders as to how things must be done. (I have no connection but as a user.)
One can hire help of course: https://www.openbsd.org/support.html . :)