What do you mean with "35 knots touchdown"?

The huey manual says to not touch down with more than 25 knots due to the risk of ripping off the skid gear... (although this would be the last thing in a long list of things in a real emergency.)..

We do that too----35kts all the way down, pull collective about 20 to 50' if you see the ground. Works like a charm.

Known in the UK Mil as a constant attitude EOL because there is no flare - yes, good fun to do.

You're talking to an old timer here, just checked my Huey manual and there is no limitation listed for touch down speed, perhaps your limit is a later addition. In any event, if having to use the 35 knot procedure in the real world being able to walk away, or at least still alive, would be the only measure of success.

Just asking: if you pull the collective at 35kt, what is the airspeed of ground contact, much more than 25kt?

That was why I was asking....

To maintain that low speed, the nose will be slightly high. Pulling pitch to cushion the touchdown tends to reduce the forward airspeed.

A low speed, constant attitude EOL (all the way to touchdown) was the RAF’s recommenced technique for a nil engine, low visibility or night landing.

Pretty much less than 25kts.