If this was a UK machine you might find a size Small Post Quarto or Imperial (7" x 9").
ISO C5 envelope is 6.38" x 9.02". Maybe you have that?
ISO B5 is 6.93" x 9.84" ... I think it would probably jam if fed SEF due to the 7/8" difference in length, but might work if fed LEF. No ... the minimum paper length is 7 3/16" so that's out.
Pull up a chair, stack the paper at your right hand (most people are right handed), and feed the bypass 150 pages at a time. That's the only way. You'll only have to load the paper 67 times. If you had used the paper tray it would have been 20 times. =^..^=
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