I'm not aware of there being an alternative & making a replacement toaster plug-in has been on my todo list for quite some time now & I'm still undecided on what I'm actually going to use to implement it when I do.
As it could be done via the OS toast notification support though that'd then limit things to win10+ setups (iirc it can work also on win8.x but it'd be simpler to limit it to being implemented as part of the win10shell plug-in & the OS requirements for that plug-in to be installed).
That does afaict allow for artwork to be shown & there'd be customisation of what text is set to be used but it's not going to match the skin aesthetic (not that I think the toaster plug-in really did) & I'd been debating using the mechanism as a means to report new build updates for long running instances from some old feedback I'd gotten.
https://github.com/mohabouje/WinToast?tab=readme-ov-file#toast-templates has some examples of what can be done so if I was to use this approach I'd likely be looking at a config option for artwork or not & then an ATF string to be used to configure what's shown (whether that's a single line allowed to wrap or specific values for each line per what the toaster api seems to allow to be set).
Otherwise it'd need to be done more like the old toaster plug-in with it making its own window & faffing around with things that way which'd allow for older OS support (I know I shouldn't focus on such things but it also has an impact for those using WINE) but probably means more time to work on developing it.
-dro