Hi Dan,
Adapter plates are cheap as chips - or even free when you buy a focuser - so I would simply get a top-notch focuser such as a Moonlite, JMI or Feathertouch and ask the supplier to send adapters for both sizes.
Any of these companies should be happy to help you out via e-mail and FWIW I prefer Moonlite's offerings as they're a little cheaper than JMI or FT and the people there gave me lots of good advice.
Best of luck!
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