I was thinking of buying a Road Worn JM body that typically has a 7.25'' radius neck but instead of using one of those, just use a 9.5'' radius neck instead, would it be possible?
Shouldn't be a problem at all. I'll be judging you, though.
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Youre officially uber shit now.

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I'm a moron tho apparently and everyone should listen to you oh wise pretentious one
No problems there, so long as you can adjust the bridge to the correct radius, which you normally can on a jazzmaster.
Rig Winter 2017:

Fender Jazzmaster/Yamaha SG1000
Boss TU-3, DS-2, CS-3, EHX small stone, Danelectro delay
Laney VC30-112 with G12H30 speaker, or Session Rockette 30 for smaller gigs
Elixir Nanoweb 11-49 strings, Dunlop Jazz III XL picks
Shure SM57 mic in front of the amp