Thank you both, makes much more sense.
Already running the K-Edge and the 36T cassette, as soon as my first DI2 grupset came in I sent off the RD to be modified. I now have two modified RDs, always carry the spare on multi-day rides or whenever I expect to be outside 40 miles from the house...Not ttoo heavy to throw in the CamelBak and you just never know...But you can bet the house that no LBS will have the necessary replacement.
May just go with the 48/30 as I already have a 30T granny and the 50/32 only loses about a 1.25T at the low end and gains 0.44T at the high end and I don't think I really care that much. Gonna sleep on it and order in the morning.
Thanks.