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Note with glasses if anyone is only long or short sighted then they simply refocus the telescope when viewing without glasses. The 20mm recommended eye relief is then not critical and less is usually fine for most people. If anyone requires glasses for strong astigmatism then that person needs to keep the glasses on when viewing otherwise the image will exhibit astigmatism and this is where 20mm eye relief is recommended.
Many people have mild astigmatism without even knowing it and images without glasses are quite acceptable. Any low cost eyepiece will work in any telescope (provided it fits) just some exhibit more aberrations than others and some are a better fit (optically to do with curvature of field) to a particular ‘scope than others. Have a look at the Bintel site and then give them a call. They will steer you right I’m sure.
Whatever you choose, enjoy!
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