Supporting breast-feeding and introducing second solid meal

[SuiGeneris]

DS is nearly 8 months old and we are thinking of introducing a second solid meal, but I am concerned that if he has too many solids he might self-wean before I want him to.

Currently his days run along these lines:
breastfeeds at 6.30am, 3pm, 7pm and 8.30/9pm, plus lunch (vegetables, meat, fruit and/or yogurt) with water around 11/11.30.

Would it be best to introduce the second solid meal at 3pm or 7pm?

7pm would seem preferable in terms of keeping the surviving breastfeeds evenly spaced over 24 hours (does it matter?) but I am concerned that if he has solids at 7pm he might take less milk at 9pm and then I might lose my supply.

3pm has the advantage that it is compatible with me going to the office (currently working from home) and still leaves him hungry for the 7 and 9pm feeds, but it is less compatible with normal meals and leaves breastfeeds less evenly spaced. WWYD?

Why not give him tea around 4.30, followed by a BF at bedtime? Or what time do you have dinner -- can't he eat with you then?

I wouldn't worry about your supply by this stage tbh, DS2 was on only two BFs a day by not much older than this, and my supply was absolutely fine.

As an example, by 8mo DS2 was having BF/food roughly like this:

7am BF
8am breakfast
10.30am (after nap) BF
12 lunch
3pm (after nap) BF
4.30pm tea
7pm BF

Thanks, that's helpful. Currently he has his last feed after (or during) our dinner, as we tend to eat between 8 and and 9pm, but DH would like DS to go to bed before we eat. I think that is unlikely to happen, because when DS goes to bed too early he then wakes up too early and I would much rather have dinner with baby and feed him at 9pm and 6.30am rather than baby going to bed at 8pm and waking, like this morning, at 5.45am!

DS is currently recovering from an illness, so is extra hungry. Today have trialled something along what you suggest:

5.45am BF
9.30 (after nap): mashed fruit
11am lunch
and plan to continue as per other days later:
3pm (after nap): BF
6pm: BF and maybe yogurt
9pm: BF and bed.

Except his day will be thrown by the early start, so unless I manage to get him to have an afternoon nap he might go to bed early again :-(