Kenko makes a 1.4x Teleconverter that works well with both EF and EF-S lenses....
This is normal as the 430 EX is an older flash and not compatible with the in-camera flash menu that first appeared in 2007 with Digic III cameras...
If the OP has a few different film camera lenses, I would recommend a mirrorless camera like a Canon M, M2, M3, etc because there are simple,...
There are many other things about Magic Lantern that I like for still photography:: 1) 1/3 stop ISO with my SL1 2) 5D3 Auto DOT Tune [MEDIA]...
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