Maybe you've already considered this option, but is Max-Prop a possibility for you -- PYI Inc. Max-Prop PSS Shaft Seal Seaview Radar Mounts R&D --
They have sizes compatible with your shaft, & on par diameter wise with what's mentioned earlier in this thread. Although I can't speak to whether or not their pitch
settings will reach into the range which you may need. The up side, however, is that they have models which needn't be disassembled in order for you to change the pitch
Which, if your pitch requirement's uncertain, then the adjustability could prove to be a boon.
If you don't have time to shop around a lot. P-yacht.com (link below) typically has competitive prices with other marine
retailers on sailing hardware
& accessories (and may even be better. They used to be it's just that I haven't shopped there in a while & thus can't state such definitively). Max Prop
Also, it might be burning up a bit of air time & giving Minney's Yacht Surplus a call. Typically they have pre-loved props in there by the crate full (literally).
: (949) 548-4192 They're in Costa Mesa, CA... so W.Coast time zone