I know this is old but I wrote a couple scripts a while ago to do the conversion for me.. here's the important one for p12 to jks https://gist.github.com/cvockrodt/77d4089f326563d830c0fa5aa651fa76. I have this run in a post hook on certbot renew

I'd almost rather ubooquity just supported pkcs12 or pem format certs than do all that..