I think your road and roudy tires are too similar, especially for FL. 44c tires for road are too big unless your entire right is down a bad sidewalk. 35c is generously sized for comfy pressures and you won’t be catching nearly as much wind.
Not sure how muddy or rough you’re getting on the roudy side, but I’d go with the RH 44c knobbies for all gravel. 44c is good for floating on firm sand and short mud puddles; you’d need to go way bigger to float on mud.
For the road - I take it this is road with light off road, Id go something closer to 35c (RH/Panaracer something or another, Challenge something, G-One Speed or Allaround, Conti Terra Speed). If you’re true 100% road, I’d look at 30-32c (RH/Panaracer something, Challenge something, Conti GP5k, Schwalbe Pro One or gone speed, Vittria Corsa Control) - going any larger and you’re going to be bouncy, catching wind, going slow for no real reason.
Normally, I’d use the stock wheels for the roudy tires, but those Roval wheels would make better road wheels for 28c+ road tires.
On the wheelset, getting a 2nd wheelset, disc, cassette is the way to fly. The gravel tires/conditions aren’t as sensitive to the wheelset as aero isn’t a big deal, nor are they taking a pounding. It sounds like you’re going with big fat fatty tires, so they’d likely be about the same wheelset anyway. If you want something sorta aero that you can use with road tires as a backup-use, I’d look for the deepest rim-section ‘gravel’ wheelset you can, which is probably 25mm. They’ll be wider than advised, but everyone (tire/wheel mfg) agrees these numbers are very dated - running a 32c tire on a 24mm internal is not a big deal.
If these are gravel only wheels, then just pickout anything that makes you happy as the shape doesn’t really matter, but you might want to consider XC MTB wheelsets (non-boost and you’d need to convert the front hub to 12mm), as you can put a really wide rim under those tires.
Id point you to the DT Swiss g1800 or GR1600; Fulcrum Rapid Red; Easton AX wheelsets. The Swiss wheelsets are probably the best value from Merlin. These will be good for both jobs, as aero as you’re going to get at the lower pricepoint, and be solid wheels.
The DT Swiss wheelset uses the same freehub as the Rovals, so you can easily/conveniently just move the freehub/cassette from one wheel to the other, saving yourself some $$$. Just pull it off, make sure you’ve got the right number of springs on the inside, plunk it down on the other wheel, and clean your hands.
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) GRX just doesn’t match to this concept. I own Canyon Grail with GRX and it’s great for the gravel job, but the gearing and weight for the road is not optimal for me. I would rather prefer Ultegra RX option with road gearing (like 50/34 at the front and 11-30 rear). Ultegra configration is not available anymore. I’m wondering if I can fit 650B wheels to new Rose Reveal 