Clamping Irregular Shaped Surface

I was working in the shop today trying to wrap up a pair of boxes I was making for my sister & niece.

I was working on completing the lids and very near final construction of the boxes themselves. I wanted to put corner splines in the lid for decoration/reinforcement. My intent was to have them flush with the bottom of the lid. After I cut the slots for th splines & went to glue them together I realized the mistake I had made…...how to clamp the splines when I had already routered the profile into the lid edges. ^&$#@!

After thinking for a while I got the idea that I could use a scrap piece of 1” dow foam on the bottom & it would compress to the shape of the profile but still provide enough stability to clamp the spline in place. After trying this I noticed there was squeeze out so it must be working? I guess the true test will be tomorrow when I cut & plane the splines to their final dimension.

The scrap foam has proved to be quite handy as I also used it to put in my router bit trays to secure the bits-future project hopefully.

Here are a few pictures of what I am trying to describe.

Thanks for looking.

Bill in MI