As for your title question, the way to let guests in without decompressing, especially with a shield such as your describe, would be to have the shield kind of form its own airlock around the arriving guest and/or their vehicle.
So, when the vehicle approaches, and the shield gets the authorization, it becomes thinner and more flexible, and bends around the vehicle (like blowing a bubble), except instead of the vehicle taking off in the little bubble, when the shield can come together behind the vehicle and seal shut, it can open the front of the bubble and draws the shield-material back to the original shield location. The vehicle, and a layer of outside air, are welcomed into the shield (and possibly a breath of inside air was lost if the front began opening a hair before the rear opening closed).
Maybe the security codes will just allow the bubble to "pop" or something to let friendly vehicles really come in - so instead of an unfriendly vehicle hitting the rigid force field, and potentially cracking or popping the field - it gets enveloped, and the enveloped bubble can be kind of controlled to nudge at the inner vehicle to slow down, change directions, and maybe land in a specific place (more damage to the vehicle the greater force behind the nudges). They don't have access to your grounds or even the inside air while still enveloped, so it's not like being inside your force-field. But being surrounded by an airtight bubble you control is a pretty vulnerable place to be if they're foes, with a safety net for if they're friends with some technical problem in their codes or your reception.
As for the rest of your specifications, you need a material that's really flexible - since sturdy enough to lean on and flexible enough to bend around a spaceship are difficult to get side-by-side. The opaque-to-translucent can be a side effect of this flexibility (if it becomes more transparent as it thins, for example, but also weaker). Airtight will come with total enclosure (no gaps) since anything strong enough to lean on can already withstand the pressure, and the ability to project images on it can be done while opaque (think simple projector, it can potentially be more advanced but doesn't have to be). Ability to withstand a laser might come from being rigid enough, or with the ability to disperse the energy, or to "heal" damage by flowing more base material into any gaps.
Depending on your tech, you need force-fields with precision and flexibility. You can fill two layers of force-fields with something that fills your other properties (something liquid-ish and in a closed system, I'm thinking, that might be able to disperse force, pulling the fields part or together to thicken or thin, etc). Or, since that might end badly if you ever get a gap or a power fluctuation, maybe fill the space between two force-fields with something more solid-ish that alters its properties based on something controllable (temp, or pressure, or presence of electricity or something) makes it flexible enough to thicken or thin or fold around and incoming vehicle or be solid enough to lean on, and use more delicate local force-fields to shape and hold it while it is acting like a liquid.
You could have specific structured ports where a different material or property could let people or vehicles in or out, or you could control the field by sections, so that only the needed area becomes permeable or flexible, while adjacent areas keep their integrity. If your dome's made from an actual material, and just shaped and controlled with force-fields, you can have projecting images or absorbing or distributing energy as a property of that material a lot less expensively (physically expensive, that is, less effort) than making a pure-energy force-field do all that work.