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If I wanted to go the two antenna route how could this be done? That way I wouldn't have to use the A/B switch.
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Not easily (inexpensively).
Before going much further, let's gather a bit more data.
There is a cluster of low-power stations ~7 miles to your south-southwest. Are you getting any of them now and are any of them important? If so, please list them.
Do you currently receive KCWX on channel 5? I don't know if they ever built their channel 8 translator in San Antonio, might check for that also.
Comment: The RCA751 is basically the same antenna as you have now except the low VHF capability was removed. The UHF and high-VHF specs for the HD7000R are probably very similar to the performance of the 751. There might be some other minor tweaks, but I've never seen any accurate data or measurements of either. I do have a relatively new 751R on hand which was "supposed" to have had the UHF section re-done for 14-51 instead of 14-69. My network analyzer suggests it's still resonant up past 800 MHz...
I bring that up because the forecasted power of KMYS is predicted to be such that it should easily come in on the back of the 7000R with it's modest F/B ratio of only 10.5 db and with a forward gain of 5.1 dB. With a forecasted noise margin of over 50 dB, that indicates to me the signal path is obstructed (trees/buildings, etc) and you're having to deal with strong reflected signals coming in on the front and a blocked path to the rear of the antenna. My suspicion is that the antenna's LOCATION relative to the stations and to your immediate surroundings needs investigation. Or, you could simply relocate the antenna to a spot where it has the clearest available line of sight towards the desired broadcast towers.
Based on your answers to the two questions above, there may (or not) be a simpler solution that avoids an A-B switch.
Let us know.