Ways to start seeds into life

Toms, peppers, aubs & chillies go in pots of seed compost in the heated prop in the house. Then pricked out. For these I've previously successfully sown individual seeds into coir plugs in the heated prop and I'm going back to that next year as this year (and last) hasn't gone so well. Celery also goes in the heated prop in a pot to be pricked out later.
Things like cucumbers, courgettes, squash, melons, sweetcorn are sown usually in individul pots in a mix of coir & mpc in the house; cucumbers & melons may go in the heated prop if there's room and depending on how warm the house is.
Lettuce I sow in trays in coir/mpc mix and always at the end of the afternoon so they get the cooler evening temperatures for the first 12 hours or so.
Turnips & bettroot are module sown in a coir/mpc mix, 2 or 3 to a singe pot and will be planted out as a whole thing. I do a small amount most weeks.
French beans are sown in a big pot in mpc, 2 pots 7 beans per pot as 14 make a good row! They don't seem to mind be brutally taken out of the pot, pulled apart and planted out! The frst batch will start in the house, subsequent sowings outside.
Leeks go thinly in big deep pots, about 100 seeds per pot in coir/mpc mix and will stay there until late June when they're planted out It seems to make no difference to the eventual size of the mature leek whether they're proper pencil sized or more normal darning needle size when they go out into the ground.
I tried chitting chilli seeds once but decided I'm too clumsy to then handle them! I should probably do this with some of the bigger, older seeds, but never remember.