I'm just saying that with the hostkit, you can execute or setup evaluating whatever you want however you want.
florin: yes, it's possible to include embedded modules or embedded extensions with R3. but it's not documented how to do so, at the moment, so you'll have to dig through the sources yourself.
for embedded modules, it could be as simple as dropping your module in src/mezz/, including its filename in src/mezz/boot-files.r and doing a full rebuild (including `prep`) after that. didn't try yet, though.