I think this is a case where a paraphrase, a close approximation would get you further. You might look at attested verbs like nuhta-, pusta-, tap-, even maybe the early Q makseta-. I think pol- is an instransitive auxiliary verb and cannot be used to mean "make able, make fit" (there is the verb kamta- "make fit, accomodate" but I am not sure that totally fits [pun not intended] the purpose). Also, ua- is not a prefix, la- or ú- would be a better fit.
Interestingly, paralysis originally meant "loosening".
Maybe even torya- "strengthen" could be used with a negative prefix, to mean "weaken, enfeeble".
[Edited on 02/28/2018 by Tamas Ferencz]
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Actually, I did not know about the "loosen" etymology of paralysis. That sounds absolutely perfect for my purposes; fortunately there is a word for that - "lehta-".
Alternatively, "nuhta-" is a close second that seems to fit.