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How do you intend on keeping the target centered? At 150x without tracking it will drift quickly.
Do you by any chance have a quality longer focal length eyepiece in the 24-25mm range?
I find the 24mm Panoptic + 2.5x Powermate an excellent combination for an effective 9.6mm eyepiece giving the eye relief and field of view of the 24mm Panoptic. Only consider this route if you have one or the other items or want a 24mm power eyepiece also or want a 2.5x Powermate also. If you don't have either then cost will be more than a single 10-11mm eyepiece.
Note you need a Powermate and not Barlow for the above to work well. A Barlow changes the angle of the rays the eyepiece sees and also plays around with the eye relief causing vignette.
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