Stik,
The Wespe was supposed to take down bombers like the Me-163, so dogfighting would not be a priority. The small size of the airframe would indicate limited fuel supply, so like the Komet, it would have had to hurry back to base after an intercept. No time to tangle with the Mustangs, Thunderbolts, and Spitfires. Bingo fuel means bail out for a VTOL aircraft!
I do think the 2x 20mm cannon armament would have been too light to reliably destroy bombers though.
Anyway, it’s a zany design so I love it! Darn, I forgot to look for the ones I started...