I think, at the end of the day, it's YOUR diabetes, and you should be able to manage it in a way that suits you.
I'm not sure what you mean by 'bring my A1c down a couple of points', so it's hard to gauge what your overall blood glucose management is currently like, except that your clinic seem to want to improve it a little, presumably to reduce the risk of long-term complications - though having lived with T1D for as long as you have, I do wonder whether the potential upheaval of changing to a new system (and possibility of hypoglycaemia during the inevitable 'settling in' period) might actually give your clinic pause for thought. Unless of course, you are beginning to see some complications develop and/or worsen and your clinic are wanting to slow the progress.
Your current system is an odd one that's for sure - you seem to be using ActRapid almost like an old bimodal/mixed insulin, but alongside Tresiba as basal support. Actrapid as approximately a 45 minute onset, followed by peak action between 45mins and approx 3 hours, then quite a long tail with overall activity of around 8ish hours.
I suspect this means you need to snack mid-morning (depending on the size of your breakfast) to keep the 3hr peak action busy, but you are likely to have less insulin active than you need for lunch, by which time the peak action has passed and the pre-breakfast dose is probably fading - not sure if you keep your carb content at lunch low as a result?
It doesn't sound like you find it easy to do 'diabetes stuff' in public places, or around your office, so I am guessing you don't regularly check BG before/after lunch to see what your levels are doing there. I'm not sure if your weekend system is the same, and whether you've done much checking around lunch to see what's happening in an environment where you feel more able to check.
Having said all that, this is your diabetes - and you have many years of management experience under your belt. It's not a style that would suit me (I switched from 2 injections a day as soon as I possibly could for the added flexibility of MDI). What matters most of course, is the results you are getting and whether your current management system is working for YOU, which with 50+ years under your belt would seem to be the case!
Incidentally, have you seen this thread about DUK's 50 year medallists?
https://forum.diabetes.org.uk/boards/threads/new-facebook-medalists-group.70900/