Thank you BSA! I have ordered Kojaks and Prestas. As for the pump – one of the reasons for switching to Prestas was to be able to use my excellent SKS pump that I currently use on my road bike. Not sure it will fit between Strida’s spokes though – unless I re-spoke it to 3-cross of course 
Anyway, I’ll have a choice between Schraders and Prestas – will see then. Thanks again!
–A