Kentmere is pretty fast but not that fast.
You can buy liquid emulsions. I don't know how fast they are but if you're into chemistry, you can add sensitising dyes (go read the "emulsion making" threads, I've no idea of what's required or whether it's possible to boost sensitivity on a commercial emulsion or whether you need to start from scratch) that will improve speed and spectral sensitivity.
You could gain a little additional speed by preflashing to get the image off the toe of the paper. The paper-neg will look greyer and your available dynamic range will be reduced but assuming you're going to contact-print the paper neg onto another paper to get a positive, that should help the original-capture speed.