Tvheadend

(corrected) You will have two muxes. These can be from two different networks with a set of tuners each. One mux for each channel. Two muxes then tie to two different Services. Those services then map to a single channel. Set the mux priority for each mux so that it will choose the first mux if a tuner is available; otherwise, it will use the other tuner. If a tuner is down then things get a little more complex. My understanding is that the only way for the that to work is for the mux to re-scan and realise that the mux "Fail" and is down. Then the channel would choose the "OK" mux over the "Fail" mux if a tuner is available.

You can easily delete services as you need. Services appear automatically as needed when you run scans. Duplicates will appear when you re-scan and something changes for that mux. If you delete and add a Service, then you need to re-map the service to channels (not an automatic thing).

Thanks! They are rearranging the muxes on feb 9 anyway and I will add another DVB-C stick also. I do not expect tuners to be down, just busy tuned to another channel. Hence my need for redundancy.