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A x2 PM would work, you'd need a 2" to T2 T thread adaptor (or buy the TV expensive PM to T thread plus a T2 adaptor)
I haven't used one, but I did see some nice results with a x2 Canon extender, you'd still need the 2" to T2 T thread adaptor.
IMHO something will a good 3 element ED x3 barlow would be close to optimum (f 7.5 x 3 = f 22.5)
HTH
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