I like Wizard summoned weapons, but I don't think Conjurer does anything particularly noteworthy with them to justify going as that subclass for that kind of build. Like I said in the post up the thread, the Conjuration PL bonus only translates into more duration for summoned weapons, which gives you some more seconds of uptime with your weapon and may save you from having to recast it again during longer fights. In practice, this bonus duration might not even be relevant for encounters beaten before your original summoned weapon wears off. If Wizard summoned weapons scaled with PL like Monk fists, I would think it more worthwhile to try to stack PL for them as a Conjurer, but as it is in the game currently, I am simply unexcited by additional duration being my only benefit in this application.
The bigger issue for me is losing Illusion spells as a Conjurer, especially if I'm going as a more melee-focused build with summoned weapons because the Illusion school offers some very welcome defensive buffs. Again, it's not the end of the world for a frontline Conjurer without Illusions spells since you can get defensive buffs from the non-restricted Enchantment spells such as Llengrath's Safeguard or Citzal's Martial Power, plus they won't actually suffer the increased recovery penalty as non-Conjuration spells due to being instant cast anyways. However, these spells have awkward conditionals such as requiring you to drop to half health before triggering or preventing subsequent spellcasting. Meanwhile, Illusion spells like Wizard's Double, Mirrored Image, and Llengrath's Displaced Image provide straightforward and effective defensive buffs while also being available much sooner than the aforementioned Enchantment alternatives. You might not need these defensive bonuses if you instead go for ranged summoned weapons like Minor Blights or Blackbow, but even then you're still only getting bonus duration with these weapons as a Conjurer.
The PL bonus is just not that impressive for Conjuration spells, and I feel like it doesn't nearly make up for the tradeoff of losing Illusion and Evocation spells when you go Conjurer subclass. I feel like you don't even look at the subclass PL bonus when going Conjurer, and just get creative like @Constentin Lévine's suggestion of cycling Conjure Familiar to get as many stat bonuses as possible. There's an opportunity cost of having to cast Conjure Familiar over and over again and needing to apply the Brilliant inspiration on the Conjurer to allow this, but at least it would be a stronger bonus compared to the subclass' innate Conjuration PL bonus.