I really liked your post, it did take me down memories lane to my early flying days with the SK lounge in Satellite 7 at T1.

You probably wound get further apart walking then T2A and T2E at CDG. Just the walk in it self must be around 25-30min. but agreed it is straight forward and probably faster then the airside terminal bus N1.

As both T1 and 3 has been closed during the pandemic im not sure how the connection to Paris is going to be. But pre pandemic you could take the RER B train (express) from T3 which is a 3-4 min ride with the CDGVAL airport train from T1. Much faster then the walk from T2A to the closest CDG train station.

Alternatively if that is not an option when T1 opens, you can go an extra stop to the CDG train station, which will take you 5-6 min with the CDGVAL and board the TGV or RER train from there.

When it comes to connecting between T1 and the AF terminals (2F/E) it is most probably going to be faster aswell.