"duplicated redundant companion" = back up relay for microprocessor protection. Even if the relay never fails, unless you either want to take the line out of service or perform testing & maintenance without protection enabled (not recommended) this is why back up is suggested. Don't forget about test switches for current / voltage and trip I/O isolation. Specifically on the GE F35, the terminals are difficult to get at for wiring in test signals. The additional cost of the test switches will easily be covered if you ever have testing done in the future and wires need to be lifted and the protection scheme recommissioned. You can also map each protective function through its own switch and parallel them together down stream of the test switch. If, for example you had an issue with a VT, knew what it was an needed to get the line back in service without 27/59 protection, you could open the test switches associated with these functions. Most manufacturers of FT Type test switches have a provision built into the cover so switches can be opened and the cover closed.
You could theoretically have 27/59 & 50/51 all mapped to the same output contact on the microprocessor protection and have it trip an electromechanical 86 device.
Depending on what you are protecting, 27/59 may not suggest serious faults and as such may not need the 'block close' (normally closed contacts of lock out in the breaker close circuit). Remember that a traditional lock out relay has (2) sets of contacts, the normally open, which trip several devices when the 86 operates and normally closed, which open up when the 86 operates and blocks the close. I have seen devices that trip only (and look nearly identical to West/GE/Electroswitch) and are generally referred to as a 94 device (Aux relay)
Although the GE F35 does have a big configurable display and many programmable push buttons available, which could make for an intelligent lockout scheme without a separate lock out device, the rolled lockout does have the history of being a device that means something serious has occurred and requires further investigation.