If it’s only one run per week and you have a history of running then this shouldn’t interfere with your plan.
I’m doing SSMV2, and I have been doing an 8-10km run on Wednesday. Wednesday is a zone 2 ride, so I haven’t felt tired on the bike. I also haven’t noticed it impacting my Thursday ride.
I also do an easy run on Friday. I’m working up to doing an easy run Monday too, but not for a couple more weeks just to make sure I can handle it.
I’d say Wednesday would be the best day. Just keep the run easy. Then you sill have mon and fri as recovery days.