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Don't be scrooge, buy the Powermate mate.
OK, I have been known to promote the E/P Projection idea, and this was partly from cost, but also practicality.
In seeing conditions that will not allow the 5x Powermate I sometimes "throttle back" by using E/P/P, and use the Zeiss orthos I have. They don't exactly fulfill the #5 criteria though.
Having them in a set, (25, 16, 12.5, 10, 8, 6, & 4mm) allows a near infinite change of image scale, with the O-8mm giving about what the 5x Powermate gives. So, if the seeing won't allow the 5x, I may try the O-10mm or O-12.5mm.
I would think that the University Optics Orthos would be a good thing to try. But I stress, try them first, if you can, as with any eyepiece, 'cos not all eyepieces work well for projection. (not sure why).
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