I've do have a KX2 on which I can make pedestrian mobile contacts from UK to Europe easily on 20 and 40m just with a short whip and rats tail and with 5 or 10 watts.
But if somebody brought a (relatively) inexpensive 10m SSB handheld to market I would buy it just to throw in the back pack ready for any chance opening, and not worry about it so much as the fragile and expensive KX2.
That Magnum/Albrecht used to be about £230. At that price I'd have it in the bottom of my bag all the time.
FM DX with a battery operated 10 meter FM HT and a really short stock handheld rubber duck antenna works just fine over very long distant E's or F2 paths and it's not much different from using qrp SSB or CW.
I have 5 countries on 29.6 and 29.3 FM and these I consider to be valid DX entities alone from the last solar cycle using a Motorola MT1000 5 watt Low band Handheld and the stock 11.5 inch rubber duck antenna with the original stock NiCad battery pack and nothing else elaborate antenna wise.
In solar cycle 24 during the years 2011 to 2020, I worked with this 5 watt HT and rubber duck New Zealand, Japan, Asiatic Russia, Australia, Mexico, Canada VE6, VO and VE3, and Hawaii which I consider to be a DX entities during Cycle 24 in 2011 to 2020.
During the same solar cycle in 2011 to 2020 the following US states were worked with the same 5 watt HT and the stock rubber duck: Oregon, Idaho, Wyoming, Montana, Arizona, Utah, California, North Carolina, Nevada, New Mexico, Texas, Colorado all from my Oregon black hole QTH.
During this new solar cycle in just the year 2022 alone, I have combined DX, US states and Canadian provinces as follows, New Zealand, Japan, Canada (VE6), Arizona, California, Wyoming and Montana all on 29.6 FM and 29.3 FM again with just the stock MT1000 Motorola HT, 11.5 inch rubber duck and internal Nicad battery pack.
The trick to FM handheld DX on 10 and even on 6 meters where it is considerably easier is to wait for the opening to peak to the point where the other ham is DFQ while at the same time moving the HT around to ensure there are no dropouts which signifies a very high peak in the opening and then to put your call out several times to the DX.
1 to 2 times out of 10 tries this works at making a quick QSO and this shows that for every 20 or so stations I try this on it results in one or 2 successful completes and this is the Fun part of 10 meter FM handheld Dx'ing.
Also it really helps if you are outside and in the clear away from buildings and such as 10 meter HT's do experience their rubber ducks detuning easily if there is a lot of clutter in the way of the radiated field.