I think this would be a better idea to save for Switch 2. I feel like it might be too much of a game-changer for a Switch Pro. The DSi and New 3DS improved specs and some features, but they weren't as significant of an upgrade as an Xbox One to Xbox One X.
I think a Switch Pro could keep pretty identical architecture to the Switch, but with a faster processor, 6 GB RAM, more flash storage, a 900p or 1080p screen, etc.
Lifetime Sales Predictions
Switch: 125 million (was 73, then 96, then 113 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 122 mil (was 100 then 130 million) Xbox One: 50 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima