Hi - Like you, I hope everything with COVID will be settled by August. I'm also hoping to take a trip to Switzerland this year, probably in September after vaccinations are completed, etc.
You mentioned hiking. Check my posting history (click on my name on the left) for a detailed trip report about hiking in the Berner Oberland in 2019.
Also, I agree that Murren and Wengen are fantastic destinations and close to excellent hiking trails. However, being car-free villages at relatively high elevations has a couple of negatives as well as all of the positives noted above. For example, if you want to take a day trip or go into Interlaken for lunch or dinner, you need to get from Murren (or Wengen) to Lauterbrunnen, and then take another train to your destination. Not a major problem (and the cable cars and mountain trains are enjoyable), but it adds time every time you leave the village -- compared to staying in Lauterbrunnen or Grindelwald.
My personal perspective is that all of the potential villages close to hiking in the Berner Oberland -- Wengen, Murren, Gimmelwald, Stechelberg, Lauterbrunnen, Grindelwald -- are wonderful, but they are very different and have their own unique advantages and disadvantages.
Grindelwald doesn't get a lot of support in these RS message boards. In other posts, however, I've noted my fondness for Grindelwald, especially if you're interested in a combination of hiking, day trips, and a larger variety of restaurants (compared to the other villages).
Please feel free to contact me if you have any questions about day hikes or hiking in the Berner Oberland in general.