Our road infrastructure is no longer fit for purpose and hasn't been for many years, this will only get worse i'm sorry to say, as FP mentions some research will be needed here.
The obvious alternative is Sainsbury's at London Colney, that's near enough South Mimms but arguably an easier exit and rejoin than the hopelessly busy A1 jct.
If you took the A405 north orbital past Watford the obvious alternative to jcts 19 to 21a (that section can be used quite successfully anyway going west if the jam is bad tween M1 and jct 19) then at Garston you'll find a Harvester eastbound side of the road, turn off on St Albans Rd the other westbound side you'll find a McD's and some other chain restaurant.
At 21a if you go towards St Albans, you come to another roundabout in 500 yards, large Shell garage on that very roundabout, carry on round the A405 nth orb that way and you go past a huge garden centre just before London Colney roundabout, that must have a tea room and loos as i haven't come across one without.
Jct 17 Maple Cross, 1/2 mile from the motorway you'll find a transport/worker type cafe thats been there years (i've been using it for 40 years), toilets a bit grim but good food at sensible prices, and theres a decent pub next door, you could follow that A405 down to Denham and you'll pass another pub if i recall but don't hold me to that cos its been some years since, easy assess back onto M40/M25 at Denham.
Just a couple of suggestions to get you going, worth perusing the online maps carefully, you could 'drive' those roads on streetview to see close ups, i avoid MSA's like the plague anyway, overpriced tat.
Edited by gordonbennet on 22/11/2018 at 15:35
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