That's an unfortunate placement indeed.
I'm sure Grant or Caelin will chime in, but I know of two options within the Shunyata line for this situation.
The first, as you've noted, is the universal cable adapter and this is the type of situation for which it was envisioned. On the positive side you can get the benefits of the Anaconda (or other Shunyata PC using the round IEC housing), but you are introducing another connection as well as a dissimilar piece of wire. I haven't had to use one yet so I can't comment on the actual sonic detriment (if any).
The other option is the Zi-Tron Z-PC10, which was designed as a very high performance cable for use in tight quarters (especially in cabinets) and is around the same level as the Cobra. It's not going to offer the same level of performance as the Anaconda, but given the unfortunate design of that amp's power inlet it may be a very good option as it uses a much smaller, rectangular IEC connector. The only issue is that while it's listed on my price sheet it's no longer listed on Shunyata's website so it may no longer be available. We haven't had a customer with a need for one so it hasn't been on my radar.
Finally, there may be a possibility of custom termination on the Anaconda using a different IEC.
Best to contact your local Shunyata dealer / distributor or contact Grant directly.