Even homes with ducted AC, it's likely they are sized for cooling only, not heat (not enough CFMs).
For 185:
https://www.arcticheatpumps.com/high-temperature-heat-pump.h...
Or much more common, if you can deal with 176F, the SANCO2 ones will generate that down to -20F.
The hydronic temperatures you're talking about are only required if you have to stick with the existing radiators. They make radiators with little fans that work at lower temperatures, or larger panel radiators. There's lots of options for lower temperature forced hot water.
As far as replacing baseboard goes, if you're going to go to that expense, then probably it's just best to switch to forced air since you also get AC.
But you'd be looking at probably close to $40K to entirely replace a forced hot water system with a heat pump and forced air (and/or replacing baseboards) as well as a DHW system of some sort -- so quite cost prohibitive.
The alternative is removing the baseboard and with a calculated heat load, replacing with panel radiators which run with much lower temperatures. The retrofit wouldn't be too difficult (compared to ducting) as it would involve running 1/2 inch PEX to each room.