...know of another alternative I could use aswell.
Have searched a fair bit but most seem to be mame type spinners(USB?)
I'm no expert, but I know a lot of people build cabinets to play these games using GroovyGameGear's TurboTwist High-Low spinner or Apache Control's Blackhawk. It seems like, if you're connecting them to an actual Forgotten Worlds machine instead of a MAME PC you could just get one of the "slave/secondary" versions that doesn't include a USB encoder.
To that end, I've also read about people using a Happ optical rotary stick to play Forgotten Worlds, though I'm not sure I can visualize how (I guess you'd use the rotary control to turn your player with stick centered and, eg, hold the stick up to turn your weapon -- feels weird). Anyway, I guess that's a possibility.
Speaking of which, you could theoretically use a standard spinner control and replace the joysticks with a "top-fire" model. You could then hold the fire button down to aim your weapon?
They aren't too cheap, but it seems like the push-pull spinners are going to make you the happiest (outside of finding an actual OEM part, of course).