It’s frustrating to see people who don’t know much about wormholes dispense advice about living in wormholes. I’ve spent years solo living in wormholes, let me give you some better info.
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Fueling a citadel is an easy task. A clonebay requires only 180 blocks a day. One DST can haul in 2 months of fuel costing ~300 mill. Even a small POS requires 240 blocks a day but has a significantly worse quality of life.
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Neither a citadel nor a POS is likely to attract much attention unless you neglect to fuel it. In terms of defense, the tedium of taking down your structure for little reward is your first defense against bigger groups. Both citadels and POSes can be fit with effective ewar, but an Astrahus is generally more defensible unless you are planning to get a large faction POS. Additionally the reinforcement mechanics are much better for citadels since you get 2 timers and can at least control the time of day the timer will come out.
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C1s are annoying to roll and C1 sites are terrible, you should look at C3s instead. There are a variety of inexpensive setups for running C3 sites which net 200-250mill an hour. There are plenty of empty C3s with LS or NS statics (whatever you prefer). Depending on how much free time you have for eve you could also consider a C2-C3/HS. The advantage this wormhole gives you is the ability to roll your C3 static for more content.
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You should definitely pursue this project if you enjoy solo gameplay in eve. Exploration, gas huffing, site running, and small scale pvp provide a lot of options for activities living solo in a wormhole.