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TheConCon666
Re the Puch bottom bracket: this looks like a re branded Raleigh Twenty, if that’s the case you can get a threadless bottom bracket pretty cheap and then use the cranks of your choice. I used a dremel to make the bb shell a little narrower on mine. Those threadless bbs are handy anyway. If you’re just after weight savings I’d say just get some lighter wheels, seatpost/saddle, cockpit etc.
Re the chain coming off on the Saracen: it looks like you have the chainring on the outer position on your cranks, move it to the inside and see if that makes a difference (along with shortening your chain and maybe buying a chain keeper).
Re bars for the Saracen: I can’t say enough good things about map/ahearne bars. They are so comfy mile after mile. They have about 40 degrees of back sweep so any bar in that neighborhood should also be good.
Your bike collection looks sick, I’m excited to see how all these turn out!