I'm sure those 'PC' parts are tight enough to hold the sword in place as long as you don't move it too much until it wears out.
If you've built Evangelion or Eureka 7's LFO kits, those limbs are extremely long and thin but still hold very well. My Nirvash Spec's legs can still hold its own weight and pose complicated Lift techniques after 2 years. And I used to change its pose every month.
Arche's great sword is just one piece of plastic and won't be too heavy.
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