Needlesports do some BD spares or the UK distributor First Ascent may be able to help, they were excellent for me.
My Z pole tips remove using a pair of self grips, dont know about flick locks though.
Yes, just order them on the t'internet, e.g here
I hate to admit to being so girly but I asked a male friend with lots of workbench and blowtorch and pliers and hot glue gun type stuff to do them for me. If you get the tips I could ask him...
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