Replacing 3-way Dimmer with Smart Dimmer

I’m trying to replace a 3-way dimmer set-up (currently a Lutron MACL-153M) with a smart dimmer. I have C by GE Smart Dimmers. After a lot of tinkering yesterday, I was unable to get it to work. I’ve made a bad MS Paint diagram of the two boxes the dimmers are currently in below.

The first dimmer is in a box with a toggle. There are two black wires (labeled A and B) going into Dimmer 1’s common screw/push port. One of these is coming from the Toggle, so I’m assuming that wire’s the line from the power source. (I believe this wire also comes from a black wire bundle in the back). Wire B is separate when it comes from the top of the box. The rest of the set-up is straightforward, with red wire on the brass screw and a white wire on the blue screw, and a spiderwebbed bare ground wire running to both the toggle and the dimmer. The one quirk here is that in addition to the white wire coming from the box, there’s a separate bundled and capped group of white wires at the back of the box, which I assume to be a group of neutrals, while the white wire from the blue screw is a traveler that hasn’t been correctly taped with black. The current dimmer model doesn’t require a neutral.

In the second dimmer, there are just four wires. A black wire to the common screw, a red wire to the brass screw, a white wire to the blue screw, and a bare ground wire. These dimmers control 8 recessed lights located physically between the two switch boxes.

Based on studying diagrams of 3-way circuiting, it looks like this is a pre-2011 switch circuit and there’s no neutral in the second box. Is there any way to replace this grouping with either a) the C by GE smart dimmers (they require a neutral) or b) some other brand of smart dimmer, or am I out of luck? And if I can use the C be GE, how do I wire it (what would be the ‘line’ wire in the second dimmer, for example)?

Thanks!