SuperLongBoard speeds for an Ultimate Bee user?

I’m wondering if anyone has a rough idea for a starting point with a 1500x1500 ultimate bee with nema 23 high torque motors and a 2.2kw spindle? The information I saw on the alt mill was a little ambiguous but I thought it would somewhat be comparable outside of rigidness.

I’m also wondering if I should still be using my limit switches from that machine or if it would be better to change to proximity switches of some sort.

I went through a nightmare of compatibility issues with the ultimate bee and spark xpro v5 and I’m just hoping to avoid as many variables as possible that would be outside of the original purpose.