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Thanks for your responses @TomvanHalen and @croft too.
Because I already bought some 11spd shifters, kind of by accident, I'd only need the derailleurs and chainrings as well - I'd keep the Force cranks.
Having rode home on my new bike with Rival 11spd last night the shifting is much better than my Force, which I've never been that impressed with tbh.
Only point of concern is that on the bike that would have this upgrade, apparently the derailleur hanger plate looks like it could be slippy even when torqued correctly. I'm worried that an FD with more cable pull wouldn't be a good idea.
NOTHING I mean nothing can match the front shifting of a full modern shimano set up even at 105 level, so if you are getting sram for tumblr points or hood shape you have to live with sub-optimal shifting so might as well save some money and stay with force 10.
I have red22 everything. Also 9000, then 6870 di2.