Just finished the initial draft of an alternate action (combat) system to use with OSRIC/BX. It’s a few pages in PDF. I’ll prolly get it up on my blog soon–I have to wrassle with formatting when I copypasta from Pages to the blog, so it’s not there yet.
The alternative system uses weapon speeds and casting time/speeds to order action, largely.
Hit me up with an email addy if you want the PDF. If it sparks enough interest, I’ll post it here for discussion of all the individual bits.