I can imagine. I've seen induction heaters that used "inverter grade" SCRs (stacks of them, because t_q is better in the lower voltage ratings; they were using 200V SCRs IIRC, small pucks), in 3rd harmonic mode, at 30kHz. So, the inverter ran at 10kHz, which is impressively fast as SCRs go.
They didn't come in for service very often (and apparently not just because of their age and presumably small population); apparently they were quite reliable for what they were. Not much tuning range though, I think those machines were only used for heat treating on wire lines (either annealing between drawing dies, or after the last die for heat treating as the case may be).
Thing with SCRs in an inverter is, if for any reason it should stop, the whole thing is a fucking bomb. Perhaps there's some merit in providing a redundant commutation circuit, I don't know. Most likely, you'll be replacing semiconductor fuses at least. (Guessing those units came in after failing to clear fuses without further damage.)
Tim