Authors with overlapping attributions-- siamltex

Question

I am trying to do the same thing that has been done in this example, and in this example, except now for the siamltex document class. I have tried adapting the solutions presented in each example, with no success.

Here's an image of what I want, but in the article class, along with the code I used to get it.

\documentclass[final]{article}
\makeatletter
\newcommand{\specificthanks}[1]{\@fnsymbol{#1}}
\makeatother

\title{Lame title}
\author{
    Francy-pants\thanks{Germany}
    \and
    Meow-face\thanks{USA}\textsuperscript{, \specificthanks{1}}
    \and
    Sizzly-pants\thanks{another part of the USA}
    \textsuperscript{, \specificthanks{3}}
}

\begin{document}
    \maketitle
\end{document}

(I do not want whatever that weird artifact is with the comma and dagger on Meow-face, but that's not important at the moment.)

This is what happens when I change the class to siamltex:

Bonus points if you can figure out a solution that is independent of document classes. (My multiple affiliations will follow me around for the next couple years, and I would hate to have to figure out a new hack for each new journal I apply to...)

---

Update I have a solution that mostly works:

\documentclass[final]{siamltex}

\title{Lame title}
\author{
    Francy-pants\thanks{Germany}
    \and
    Meow-face\footnotemark[1]\textsuperscript{ ,}\thanks{USA}
    \and
    Sizzly-pants\footnotemark[2]\textsuperscript{ ,}\thanks{another part of the USA}
}

\begin{document}
    \maketitle
\end{document}

The only complaint I have with this solution is that the order is not flexible. For example, if Meow-face is a super picky person and would like their USA affiliation to be listed before their German one, I wouldn't know how to interchange the asterisk and the dagger, since the \footnotemark and \thanks commands cannot be interchanged without errors.