using what you have, put your "money" mics and pres on the stereo
overhead.

A quick guess at this would be the 4050s into the Focusrite 8. or the
Beyers into the Focusrite.

The 421 can work on a kick.

So that's three tracks.

If you want a 4th track, just stick the Beyer somewhere casual like
6-8 feet out in front of the kit. you might be able to blend it in
the mix and add some mojo.

if the drummer plays evenly like you said, you should be able to get a
very good sound with the 2-overheads, one-kick mic setup. just put a
compressor over the whole drum buss during mixing. it will suck it
all up and make it big sounding and add some more room presence.

you should be fine with what you have.