Welcome Ainsley, my GS it's also egg intolerant and I have made him custard without the eggs just added more corn flour and some vanilla extract, can't remember how much extra corn flour maybe two tablespoons. GS and I also love the Thermomix porridge it is so creamy.
Hi and welcome to the forum.. You will find kids get used to the sound.. My kids were terrified of it at first but now doesnt bother them and they recognise the thermie thingy lol... I used o warn them and get hem to cover their ears .. We used o laugh about here we go with the noise...