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As my UHF and VHF antennas will be separated by necessity by about 20' I'll have to amp them individually.
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You're probably making this much more difficult than it needs to be. I doubt you actually need to amp UHF and VHF separately. 20' of RG6 coax only attenuates VHF signals by about .6 dB which is pretty close to nothing in the grand scheme of things. Based on your chart, KOMU and KRCG should have ample margin to tolerate that little extra bit of insertion loss. Plus, you completely omitted the factor that you'd then need TWO HLSJ devices as high pass filters, one for each amp.
Here's my specific recommendation:
Mount UHF antenna where it needs to be and the VHF antenna where it needs to be. Run a cable from the VHF antenna to the UHF antenna's location and combine them using the UVSJ. Run that into the capped HLSJ to eliminate everything below channel 7, then immediately amplify with the KT500. Install the power inserter at the other end of your lead-in and you're done.
Your proposed scheme adds the cost of a second amp, a second cable run, a second FM filter, and double the amplifier power consumption all in a effort to save 6/10ths of a dB of signal on the VHF band. Therefore, I have to ask you, do you really need that?
Follow the K.I.S.S principle.