The VMCC shop, tyre section, advertise a 300 x 20 inner tube for the Ensign Universal tyre at £14. I have no idea of the quality or where these are made but 300 x 20 tubes seem unavailable anywhere else at present, unless you know differently.
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I fitted a 21" stainless rim on my B Rapide for the same reason. It gives better handling as well as making tyre/tube selection easier (& cheaper). I also have a 21" front wheel on my C Comet. I wouldn't go back to a 20" rim on either but have retainedsome years ago i fitted a 21" rim to avoid this problem but with this solution i am also not happy, the bike is to much up at the front. will go back to 20" rim again.
Regards, van Drenth JC